2011-06-30 17:37:13 +02:00
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/*
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Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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2000-10-07 13:59:47 +02:00
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2000-07-31 21:29:14 +02:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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2006-12-23 20:17:15 +01:00
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the Free Software Foundation; version 2 of the License.
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2000-10-07 13:59:47 +02:00
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2000-07-31 21:29:14 +02:00
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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2000-10-07 13:59:47 +02:00
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2000-07-31 21:29:14 +02:00
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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2011-06-30 17:37:13 +02:00
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2000-07-31 21:29:14 +02:00
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/* classes to use when handling where clause */
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#ifndef _opt_range_h
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#define _opt_range_h
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2005-05-04 15:05:56 +02:00
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#ifdef USE_PRAGMA_INTERFACE
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2000-07-31 21:29:14 +02:00
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#pragma interface /* gcc class implementation */
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#endif
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typedef struct st_key_part {
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2007-11-06 19:57:51 +01:00
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uint16 key,part;
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/* See KEY_PART_INFO for meaning of the next two: */
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uint16 store_length, length;
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2006-11-02 14:11:53 +01:00
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uint8 null_bit;
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2007-11-06 19:57:51 +01:00
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/*
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Keypart flags (0 when this structure is used by partition pruning code
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for fake partitioning index description)
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*/
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2006-11-02 14:11:53 +01:00
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uint8 flag;
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2002-02-22 12:24:42 +01:00
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Field *field;
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Field::imagetype image_type;
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2000-07-31 21:29:14 +02:00
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} KEY_PART;
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2002-06-08 20:02:01 +02:00
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2000-07-31 21:29:14 +02:00
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class QUICK_RANGE :public Sql_alloc {
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public:
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WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
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uchar *min_key,*max_key;
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2000-07-31 21:29:14 +02:00
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uint16 min_length,max_length,flag;
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2007-03-17 00:13:25 +01:00
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key_part_map min_keypart_map, // bitmap of used keyparts in min_key
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max_keypart_map; // bitmap of used keyparts in max_key
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2002-06-08 20:02:01 +02:00
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#ifdef HAVE_purify
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uint16 dummy; /* Avoid warnings on 'flag' */
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#endif
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2000-07-31 21:29:14 +02:00
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QUICK_RANGE(); /* Full range */
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WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
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QUICK_RANGE(const uchar *min_key_arg, uint min_length_arg,
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2007-03-17 00:13:25 +01:00
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key_part_map min_keypart_map_arg,
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WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
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const uchar *max_key_arg, uint max_length_arg,
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2007-03-17 00:13:25 +01:00
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key_part_map max_keypart_map_arg,
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2000-07-31 21:29:14 +02:00
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uint flag_arg)
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WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
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: min_key((uchar*) sql_memdup(min_key_arg,min_length_arg+1)),
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max_key((uchar*) sql_memdup(max_key_arg,max_length_arg+1)),
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2001-12-05 12:03:00 +01:00
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min_length((uint16) min_length_arg),
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max_length((uint16) max_length_arg),
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2007-04-16 18:16:17 +02:00
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flag((uint16) flag_arg),
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2007-01-29 10:40:26 +01:00
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min_keypart_map(min_keypart_map_arg),
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2007-04-16 18:16:17 +02:00
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max_keypart_map(max_keypart_map_arg)
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2002-06-08 20:02:01 +02:00
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{
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#ifdef HAVE_purify
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dummy=0;
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#endif
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}
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2010-05-10 09:23:23 +02:00
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/**
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Initalizes a key_range object for communication with storage engine.
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This function facilitates communication with the Storage Engine API by
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translating the minimum endpoint of the interval represented by this
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QUICK_RANGE into an index range endpoint specifier for the engine.
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@param Pointer to an uninitialized key_range C struct.
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@param prefix_length The length of the search key prefix to be used for
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lookup.
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@param keypart_map A set (bitmap) of keyparts to be used.
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*/
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void make_min_endpoint(key_range *kr, uint prefix_length,
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key_part_map keypart_map) {
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make_min_endpoint(kr);
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kr->length= min(kr->length, prefix_length);
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kr->keypart_map&= keypart_map;
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}
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/**
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Initalizes a key_range object for communication with storage engine.
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This function facilitates communication with the Storage Engine API by
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translating the minimum endpoint of the interval represented by this
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QUICK_RANGE into an index range endpoint specifier for the engine.
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@param Pointer to an uninitialized key_range C struct.
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*/
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void make_min_endpoint(key_range *kr) {
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kr->key= (const uchar*)min_key;
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kr->length= min_length;
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kr->keypart_map= min_keypart_map;
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kr->flag= ((flag & NEAR_MIN) ? HA_READ_AFTER_KEY :
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(flag & EQ_RANGE) ? HA_READ_KEY_EXACT : HA_READ_KEY_OR_NEXT);
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}
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/**
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Initalizes a key_range object for communication with storage engine.
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This function facilitates communication with the Storage Engine API by
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translating the maximum endpoint of the interval represented by this
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QUICK_RANGE into an index range endpoint specifier for the engine.
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@param Pointer to an uninitialized key_range C struct.
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@param prefix_length The length of the search key prefix to be used for
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lookup.
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@param keypart_map A set (bitmap) of keyparts to be used.
|
|
|
|
|
*/
|
|
|
|
|
void make_max_endpoint(key_range *kr, uint prefix_length,
|
|
|
|
|
key_part_map keypart_map) {
|
|
|
|
|
make_max_endpoint(kr);
|
|
|
|
|
kr->length= min(kr->length, prefix_length);
|
|
|
|
|
kr->keypart_map&= keypart_map;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
Initalizes a key_range object for communication with storage engine.
|
|
|
|
|
|
|
|
|
|
This function facilitates communication with the Storage Engine API by
|
|
|
|
|
translating the maximum endpoint of the interval represented by this
|
|
|
|
|
QUICK_RANGE into an index range endpoint specifier for the engine.
|
|
|
|
|
|
|
|
|
|
@param Pointer to an uninitialized key_range C struct.
|
|
|
|
|
*/
|
|
|
|
|
void make_max_endpoint(key_range *kr) {
|
|
|
|
|
kr->key= (const uchar*)max_key;
|
|
|
|
|
kr->length= max_length;
|
|
|
|
|
kr->keypart_map= max_keypart_map;
|
|
|
|
|
/*
|
|
|
|
|
We use READ_AFTER_KEY here because if we are reading on a key
|
|
|
|
|
prefix we want to find all keys with this prefix
|
|
|
|
|
*/
|
|
|
|
|
kr->flag= (flag & NEAR_MAX ? HA_READ_BEFORE_KEY : HA_READ_AFTER_KEY);
|
|
|
|
|
}
|
2000-07-31 21:29:14 +02:00
|
|
|
};
|
|
|
|
|
|
2001-06-29 03:04:29 +02:00
|
|
|
|
2003-11-13 15:52:02 +01:00
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
Quick select interface.
|
2003-12-09 21:40:02 +01:00
|
|
|
This class is a parent for all QUICK_*_SELECT and FT_SELECT classes.
|
2007-03-17 00:13:25 +01:00
|
|
|
|
2004-12-29 14:07:27 +01:00
|
|
|
The usage scenario is as follows:
|
|
|
|
|
1. Create quick select
|
|
|
|
|
quick= new QUICK_XXX_SELECT(...);
|
2007-03-17 00:13:25 +01:00
|
|
|
|
2004-12-29 14:07:27 +01:00
|
|
|
2. Perform lightweight initialization. This can be done in 2 ways:
|
|
|
|
|
2.a: Regular initialization
|
|
|
|
|
if (quick->init())
|
|
|
|
|
{
|
|
|
|
|
//the only valid action after failed init() call is delete
|
|
|
|
|
delete quick;
|
|
|
|
|
}
|
|
|
|
|
2.b: Special initialization for quick selects merged by QUICK_ROR_*_SELECT
|
|
|
|
|
if (quick->init_ror_merged_scan())
|
|
|
|
|
delete quick;
|
2007-03-17 00:13:25 +01:00
|
|
|
|
2004-12-29 14:07:27 +01:00
|
|
|
3. Perform zero, one, or more scans.
|
|
|
|
|
while (...)
|
|
|
|
|
{
|
|
|
|
|
// initialize quick select for scan. This may allocate
|
2007-03-17 00:13:25 +01:00
|
|
|
// buffers and/or prefetch rows.
|
2004-12-29 14:07:27 +01:00
|
|
|
if (quick->reset())
|
|
|
|
|
{
|
|
|
|
|
//the only valid action after failed reset() call is delete
|
|
|
|
|
delete quick;
|
|
|
|
|
//abort query
|
|
|
|
|
}
|
2007-03-17 00:13:25 +01:00
|
|
|
|
2004-12-29 14:07:27 +01:00
|
|
|
// perform the scan
|
|
|
|
|
do
|
|
|
|
|
{
|
|
|
|
|
res= quick->get_next();
|
|
|
|
|
} while (res && ...)
|
|
|
|
|
}
|
2007-03-17 00:13:25 +01:00
|
|
|
|
2004-12-29 14:07:27 +01:00
|
|
|
4. Delete the select:
|
|
|
|
|
delete quick;
|
2007-03-17 00:13:25 +01:00
|
|
|
|
2003-11-13 15:52:02 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
class QUICK_SELECT_I
|
|
|
|
|
{
|
2000-07-31 21:29:14 +02:00
|
|
|
public:
|
2004-05-14 16:00:57 +02:00
|
|
|
bool sorted;
|
2003-11-13 15:52:02 +01:00
|
|
|
ha_rows records; /* estimate of # of records to be retrieved */
|
|
|
|
|
double read_time; /* time to perform this retrieval */
|
|
|
|
|
TABLE *head;
|
|
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
Index this quick select uses, or MAX_KEY for quick selects
|
2004-05-12 23:38:40 +02:00
|
|
|
that use several indexes
|
2003-11-13 15:52:02 +01:00
|
|
|
*/
|
2004-05-12 23:38:40 +02:00
|
|
|
uint index;
|
2003-11-13 15:52:02 +01:00
|
|
|
|
|
|
|
|
/*
|
2004-05-29 00:04:01 +02:00
|
|
|
Total length of first used_key_parts parts of the key.
|
|
|
|
|
Applicable if index!= MAX_KEY.
|
2003-11-13 15:52:02 +01:00
|
|
|
*/
|
2004-05-29 00:04:01 +02:00
|
|
|
uint max_used_key_length;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
Max. number of (first) key parts this quick select uses for retrieval.
|
|
|
|
|
eg. for "(key1p1=c1 AND key1p2=c2) OR key1p1=c2" used_key_parts == 2.
|
|
|
|
|
Applicable if index!= MAX_KEY.
|
2007-03-17 00:13:25 +01:00
|
|
|
|
|
|
|
|
For QUICK_GROUP_MIN_MAX_SELECT it includes MIN/MAX argument keyparts.
|
2004-05-29 00:04:01 +02:00
|
|
|
*/
|
|
|
|
|
uint used_key_parts;
|
2003-11-13 15:52:02 +01:00
|
|
|
|
|
|
|
|
QUICK_SELECT_I();
|
|
|
|
|
virtual ~QUICK_SELECT_I(){};
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
/*
|
|
|
|
|
Do post-constructor initialization.
|
|
|
|
|
SYNOPSIS
|
|
|
|
|
init()
|
2004-07-21 00:45:08 +02:00
|
|
|
|
|
|
|
|
init() performs initializations that should have been in constructor if
|
|
|
|
|
it was possible to return errors from constructors. The join optimizer may
|
2004-05-29 00:04:01 +02:00
|
|
|
create and then delete quick selects without retrieving any rows so init()
|
|
|
|
|
must not contain any IO or CPU intensive code.
|
|
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
If init() call fails the only valid action is to delete this quick select,
|
2004-05-29 00:04:01 +02:00
|
|
|
reset() and get_next() must not be called.
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
RETURN
|
|
|
|
|
0 OK
|
|
|
|
|
other Error code
|
2004-03-15 21:11:58 +01:00
|
|
|
*/
|
2003-11-13 15:52:02 +01:00
|
|
|
virtual int init() = 0;
|
2004-07-21 00:45:08 +02:00
|
|
|
|
|
|
|
|
/*
|
2004-05-29 00:04:01 +02:00
|
|
|
Initialize quick select for row retrieval.
|
|
|
|
|
SYNOPSIS
|
|
|
|
|
reset()
|
2004-07-21 00:45:08 +02:00
|
|
|
|
|
|
|
|
reset() should be called when it is certain that row retrieval will be
|
2004-05-29 00:04:01 +02:00
|
|
|
necessary. This call may do heavyweight initialization like buffering first
|
|
|
|
|
N records etc. If reset() call fails get_next() must not be called.
|
2004-12-29 14:07:27 +01:00
|
|
|
Note that reset() may be called several times if
|
|
|
|
|
* the quick select is executed in a subselect
|
|
|
|
|
* a JOIN buffer is used
|
|
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
RETURN
|
|
|
|
|
0 OK
|
|
|
|
|
other Error code
|
2004-03-15 21:11:58 +01:00
|
|
|
*/
|
2003-11-24 18:54:57 +01:00
|
|
|
virtual int reset(void) = 0;
|
2004-07-15 03:19:07 +02:00
|
|
|
|
2004-12-23 21:45:10 +01:00
|
|
|
virtual int get_next() = 0; /* get next record to retrieve */
|
|
|
|
|
|
2004-07-15 03:19:07 +02:00
|
|
|
/* Range end should be called when we have looped over the whole index */
|
|
|
|
|
virtual void range_end() {}
|
2004-12-23 21:45:10 +01:00
|
|
|
|
2003-11-13 15:52:02 +01:00
|
|
|
virtual bool reverse_sorted() = 0;
|
|
|
|
|
virtual bool unique_key_range() { return false; }
|
2010-11-23 11:18:47 +01:00
|
|
|
virtual bool clustered_pk_range() { return false; }
|
2003-11-13 15:52:02 +01:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
enum {
|
2003-11-13 15:52:02 +01:00
|
|
|
QS_TYPE_RANGE = 0,
|
|
|
|
|
QS_TYPE_INDEX_MERGE = 1,
|
|
|
|
|
QS_TYPE_RANGE_DESC = 2,
|
2004-05-12 23:38:40 +02:00
|
|
|
QS_TYPE_FULLTEXT = 3,
|
|
|
|
|
QS_TYPE_ROR_INTERSECT = 4,
|
2004-08-27 15:37:13 +02:00
|
|
|
QS_TYPE_ROR_UNION = 5,
|
|
|
|
|
QS_TYPE_GROUP_MIN_MAX = 6
|
2003-11-13 15:52:02 +01:00
|
|
|
};
|
|
|
|
|
|
2004-05-12 23:38:40 +02:00
|
|
|
/* Get type of this quick select - one of the QS_TYPE_* values */
|
|
|
|
|
virtual int get_type() = 0;
|
|
|
|
|
|
|
|
|
|
/*
|
2004-05-29 00:04:01 +02:00
|
|
|
Initialize this quick select as a merged scan inside a ROR-union or a ROR-
|
2004-07-21 00:45:08 +02:00
|
|
|
intersection scan. The caller must not additionally call init() if this
|
2004-05-29 00:04:01 +02:00
|
|
|
function is called.
|
|
|
|
|
SYNOPSIS
|
|
|
|
|
init_ror_merged_scan()
|
This changeset is largely a handler cleanup changeset (WL#3281), but includes fixes and cleanups that was found necessary while testing the handler changes
Changes that requires code changes in other code of other storage engines.
(Note that all changes are very straightforward and one should find all issues
by compiling a --debug build and fixing all compiler errors and all
asserts in field.cc while running the test suite),
- New optional handler function introduced: reset()
This is called after every DML statement to make it easy for a handler to
statement specific cleanups.
(The only case it's not called is if force the file to be closed)
- handler::extra(HA_EXTRA_RESET) is removed. Code that was there before
should be moved to handler::reset()
- table->read_set contains a bitmap over all columns that are needed
in the query. read_row() and similar functions only needs to read these
columns
- table->write_set contains a bitmap over all columns that will be updated
in the query. write_row() and update_row() only needs to update these
columns.
The above bitmaps should now be up to date in all context
(including ALTER TABLE, filesort()).
The handler is informed of any changes to the bitmap after
fix_fields() by calling the virtual function
handler::column_bitmaps_signal(). If the handler does caching of
these bitmaps (instead of using table->read_set, table->write_set),
it should redo the caching in this code. as the signal() may be sent
several times, it's probably best to set a variable in the signal
and redo the caching on read_row() / write_row() if the variable was
set.
- Removed the read_set and write_set bitmap objects from the handler class
- Removed all column bit handling functions from the handler class.
(Now one instead uses the normal bitmap functions in my_bitmap.c instead
of handler dedicated bitmap functions)
- field->query_id is removed. One should instead instead check
table->read_set and table->write_set if a field is used in the query.
- handler::extra(HA_EXTRA_RETRIVE_ALL_COLS) and
handler::extra(HA_EXTRA_RETRIEVE_PRIMARY_KEY) are removed. One should now
instead use table->read_set to check for which columns to retrieve.
- If a handler needs to call Field->val() or Field->store() on columns
that are not used in the query, one should install a temporary
all-columns-used map while doing so. For this, we provide the following
functions:
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->read_set);
field->val();
dbug_tmp_restore_column_map(table->read_set, old_map);
and similar for the write map:
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->write_set);
field->val();
dbug_tmp_restore_column_map(table->write_set, old_map);
If this is not done, you will sooner or later hit a DBUG_ASSERT
in the field store() / val() functions.
(For not DBUG binaries, the dbug_tmp_restore_column_map() and
dbug_tmp_restore_column_map() are inline dummy functions and should
be optimized away be the compiler).
- If one needs to temporary set the column map for all binaries (and not
just to avoid the DBUG_ASSERT() in the Field::store() / Field::val()
methods) one should use the functions tmp_use_all_columns() and
tmp_restore_column_map() instead of the above dbug_ variants.
- All 'status' fields in the handler base class (like records,
data_file_length etc) are now stored in a 'stats' struct. This makes
it easier to know what status variables are provided by the base
handler. This requires some trivial variable names in the extra()
function.
- New virtual function handler::records(). This is called to optimize
COUNT(*) if (handler::table_flags() & HA_HAS_RECORDS()) is true.
(stats.records is not supposed to be an exact value. It's only has to
be 'reasonable enough' for the optimizer to be able to choose a good
optimization path).
- Non virtual handler::init() function added for caching of virtual
constants from engine.
- Removed has_transactions() virtual method. Now one should instead return
HA_NO_TRANSACTIONS in table_flags() if the table handler DOES NOT support
transactions.
- The 'xxxx_create_handler()' function now has a MEM_ROOT_root argument
that is to be used with 'new handler_name()' to allocate the handler
in the right area. The xxxx_create_handler() function is also
responsible for any initialization of the object before returning.
For example, one should change:
static handler *myisam_create_handler(TABLE_SHARE *table)
{
return new ha_myisam(table);
}
->
static handler *myisam_create_handler(TABLE_SHARE *table, MEM_ROOT *mem_root)
{
return new (mem_root) ha_myisam(table);
}
- New optional virtual function: use_hidden_primary_key().
This is called in case of an update/delete when
(table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined
but we don't have a primary key. This allows the handler to take precisions
in remembering any hidden primary key to able to update/delete any
found row. The default handler marks all columns to be read.
- handler::table_flags() now returns a ulonglong (to allow for more flags).
- New/changed table_flags()
- HA_HAS_RECORDS Set if ::records() is supported
- HA_NO_TRANSACTIONS Set if engine doesn't support transactions
- HA_PRIMARY_KEY_REQUIRED_FOR_DELETE
Set if we should mark all primary key columns for
read when reading rows as part of a DELETE
statement. If there is no primary key,
all columns are marked for read.
- HA_PARTIAL_COLUMN_READ Set if engine will not read all columns in some
cases (based on table->read_set)
- HA_PRIMARY_KEY_ALLOW_RANDOM_ACCESS
Renamed to HA_PRIMARY_KEY_REQUIRED_FOR_POSITION.
- HA_DUPP_POS Renamed to HA_DUPLICATE_POS
- HA_REQUIRES_KEY_COLUMNS_FOR_DELETE
Set this if we should mark ALL key columns for
read when when reading rows as part of a DELETE
statement. In case of an update we will mark
all keys for read for which key part changed
value.
- HA_STATS_RECORDS_IS_EXACT
Set this if stats.records is exact.
(This saves us some extra records() calls
when optimizing COUNT(*))
- Removed table_flags()
- HA_NOT_EXACT_COUNT Now one should instead use HA_HAS_RECORDS if
handler::records() gives an exact count() and
HA_STATS_RECORDS_IS_EXACT if stats.records is exact.
- HA_READ_RND_SAME Removed (no one supported this one)
- Removed not needed functions ha_retrieve_all_cols() and ha_retrieve_all_pk()
- Renamed handler::dupp_pos to handler::dup_pos
- Removed not used variable handler::sortkey
Upper level handler changes:
- ha_reset() now does some overall checks and calls ::reset()
- ha_table_flags() added. This is a cached version of table_flags(). The
cache is updated on engine creation time and updated on open.
MySQL level changes (not obvious from the above):
- DBUG_ASSERT() added to check that column usage matches what is set
in the column usage bit maps. (This found a LOT of bugs in current
column marking code).
- In 5.1 before, all used columns was marked in read_set and only updated
columns was marked in write_set. Now we only mark columns for which we
need a value in read_set.
- Column bitmaps are created in open_binary_frm() and open_table_from_share().
(Before this was in table.cc)
- handler::table_flags() calls are replaced with handler::ha_table_flags()
- For calling field->val() you must have the corresponding bit set in
table->read_set. For calling field->store() you must have the
corresponding bit set in table->write_set. (There are asserts in
all store()/val() functions to catch wrong usage)
- thd->set_query_id is renamed to thd->mark_used_columns and instead
of setting this to an integer value, this has now the values:
MARK_COLUMNS_NONE, MARK_COLUMNS_READ, MARK_COLUMNS_WRITE
Changed also all variables named 'set_query_id' to mark_used_columns.
- In filesort() we now inform the handler of exactly which columns are needed
doing the sort and choosing the rows.
- The TABLE_SHARE object has a 'all_set' column bitmap one can use
when one needs a column bitmap with all columns set.
(This is used for table->use_all_columns() and other places)
- The TABLE object has 3 column bitmaps:
- def_read_set Default bitmap for columns to be read
- def_write_set Default bitmap for columns to be written
- tmp_set Can be used as a temporary bitmap when needed.
The table object has also two pointer to bitmaps read_set and write_set
that the handler should use to find out which columns are used in which way.
- count() optimization now calls handler::records() instead of using
handler->stats.records (if (table_flags() & HA_HAS_RECORDS) is true).
- Added extra argument to Item::walk() to indicate if we should also
traverse sub queries.
- Added TABLE parameter to cp_buffer_from_ref()
- Don't close tables created with CREATE ... SELECT but keep them in
the table cache. (Faster usage of newly created tables).
New interfaces:
- table->clear_column_bitmaps() to initialize the bitmaps for tables
at start of new statements.
- table->column_bitmaps_set() to set up new column bitmaps and signal
the handler about this.
- table->column_bitmaps_set_no_signal() for some few cases where we need
to setup new column bitmaps but don't signal the handler (as the handler
has already been signaled about these before). Used for the momement
only in opt_range.cc when doing ROR scans.
- table->use_all_columns() to install a bitmap where all columns are marked
as use in the read and the write set.
- table->default_column_bitmaps() to install the normal read and write
column bitmaps, but not signaling the handler about this.
This is mainly used when creating TABLE instances.
- table->mark_columns_needed_for_delete(),
table->mark_columns_needed_for_delete() and
table->mark_columns_needed_for_insert() to allow us to put additional
columns in column usage maps if handler so requires.
(The handler indicates what it neads in handler->table_flags())
- table->prepare_for_position() to allow us to tell handler that it
needs to read primary key parts to be able to store them in
future table->position() calls.
(This replaces the table->file->ha_retrieve_all_pk function)
- table->mark_auto_increment_column() to tell handler are going to update
columns part of any auto_increment key.
- table->mark_columns_used_by_index() to mark all columns that is part of
an index. It will also send extra(HA_EXTRA_KEYREAD) to handler to allow
it to quickly know that it only needs to read colums that are part
of the key. (The handler can also use the column map for detecting this,
but simpler/faster handler can just monitor the extra() call).
- table->mark_columns_used_by_index_no_reset() to in addition to other columns,
also mark all columns that is used by the given key.
- table->restore_column_maps_after_mark_index() to restore to default
column maps after a call to table->mark_columns_used_by_index().
- New item function register_field_in_read_map(), for marking used columns
in table->read_map. Used by filesort() to mark all used columns
- Maintain in TABLE->merge_keys set of all keys that are used in query.
(Simplices some optimization loops)
- Maintain Field->part_of_key_not_clustered which is like Field->part_of_key
but the field in the clustered key is not assumed to be part of all index.
(used in opt_range.cc for faster loops)
- dbug_tmp_use_all_columns(), dbug_tmp_restore_column_map()
tmp_use_all_columns() and tmp_restore_column_map() functions to temporally
mark all columns as usable. The 'dbug_' version is primarily intended
inside a handler when it wants to just call Field:store() & Field::val()
functions, but don't need the column maps set for any other usage.
(ie:: bitmap_is_set() is never called)
- We can't use compare_records() to skip updates for handlers that returns
a partial column set and the read_set doesn't cover all columns in the
write set. The reason for this is that if we have a column marked only for
write we can't in the MySQL level know if the value changed or not.
The reason this worked before was that MySQL marked all to be written
columns as also to be read. The new 'optimal' bitmaps exposed this 'hidden
bug'.
- open_table_from_share() does not anymore setup temporary MEM_ROOT
object as a thread specific variable for the handler. Instead we
send the to-be-used MEMROOT to get_new_handler().
(Simpler, faster code)
Bugs fixed:
- Column marking was not done correctly in a lot of cases.
(ALTER TABLE, when using triggers, auto_increment fields etc)
(Could potentially result in wrong values inserted in table handlers
relying on that the old column maps or field->set_query_id was correct)
Especially when it comes to triggers, there may be cases where the
old code would cause lost/wrong values for NDB and/or InnoDB tables.
- Split thd->options flag OPTION_STATUS_NO_TRANS_UPDATE to two flags:
OPTION_STATUS_NO_TRANS_UPDATE and OPTION_KEEP_LOG.
This allowed me to remove some wrong warnings about:
"Some non-transactional changed tables couldn't be rolled back"
- Fixed handling of INSERT .. SELECT and CREATE ... SELECT that wrongly reset
(thd->options & OPTION_STATUS_NO_TRANS_UPDATE) which caused us to loose
some warnings about
"Some non-transactional changed tables couldn't be rolled back")
- Fixed use of uninitialized memory in ha_ndbcluster.cc::delete_table()
which could cause delete_table to report random failures.
- Fixed core dumps for some tests when running with --debug
- Added missing FN_LIBCHAR in mysql_rm_tmp_tables()
(This has probably caused us to not properly remove temporary files after
crash)
- slow_logs was not properly initialized, which could maybe cause
extra/lost entries in slow log.
- If we get an duplicate row on insert, change column map to read and
write all columns while retrying the operation. This is required by
the definition of REPLACE and also ensures that fields that are only
part of UPDATE are properly handled. This fixed a bug in NDB and
REPLACE where REPLACE wrongly copied some column values from the replaced
row.
- For table handler that doesn't support NULL in keys, we would give an error
when creating a primary key with NULL fields, even after the fields has been
automaticly converted to NOT NULL.
- Creating a primary key on a SPATIAL key, would fail if field was not
declared as NOT NULL.
Cleanups:
- Removed not used condition argument to setup_tables
- Removed not needed item function reset_query_id_processor().
- Field->add_index is removed. Now this is instead maintained in
(field->flags & FIELD_IN_ADD_INDEX)
- Field->fieldnr is removed (use field->field_index instead)
- New argument to filesort() to indicate that it should return a set of
row pointers (not used columns). This allowed me to remove some references
to sql_command in filesort and should also enable us to return column
results in some cases where we couldn't before.
- Changed column bitmap handling in opt_range.cc to be aligned with TABLE
bitmap, which allowed me to use bitmap functions instead of looping over
all fields to create some needed bitmaps. (Faster and smaller code)
- Broke up found too long lines
- Moved some variable declaration at start of function for better code
readability.
- Removed some not used arguments from functions.
(setup_fields(), mysql_prepare_insert_check_table())
- setup_fields() now takes an enum instead of an int for marking columns
usage.
- For internal temporary tables, use handler::write_row(),
handler::delete_row() and handler::update_row() instead of
handler::ha_xxxx() for faster execution.
- Changed some constants to enum's and define's.
- Using separate column read and write sets allows for easier checking
of timestamp field was set by statement.
- Remove calls to free_io_cache() as this is now done automaticly in ha_reset()
- Don't build table->normalized_path as this is now identical to table->path
(after bar's fixes to convert filenames)
- Fixed some missed DBUG_PRINT(.."%lx") to use "0x%lx" to make it easier to
do comparision with the 'convert-dbug-for-diff' tool.
Things left to do in 5.1:
- We wrongly log failed CREATE TABLE ... SELECT in some cases when using
row based logging (as shown by testcase binlog_row_mix_innodb_myisam.result)
Mats has promised to look into this.
- Test that my fix for CREATE TABLE ... SELECT is indeed correct.
(I added several test cases for this, but in this case it's better that
someone else also tests this throughly).
Lars has promosed to do this.
2006-06-04 17:52:22 +02:00
|
|
|
reuse_handler If true, the quick select may use table->handler,
|
|
|
|
|
otherwise it must create and use a separate handler
|
|
|
|
|
object.
|
2004-06-01 13:31:58 +02:00
|
|
|
RETURN
|
|
|
|
|
0 Ok
|
2004-07-21 00:45:08 +02:00
|
|
|
other Error
|
2004-05-12 23:38:40 +02:00
|
|
|
*/
|
2004-05-29 00:04:01 +02:00
|
|
|
virtual int init_ror_merged_scan(bool reuse_handler)
|
2004-05-12 23:38:40 +02:00
|
|
|
{ DBUG_ASSERT(0); return 1; }
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-06-01 13:31:58 +02:00
|
|
|
/*
|
|
|
|
|
Save ROWID of last retrieved row in file->ref. This used in ROR-merging.
|
|
|
|
|
*/
|
2004-05-12 23:38:40 +02:00
|
|
|
virtual void save_last_pos(){};
|
|
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
/*
|
2004-05-29 00:04:01 +02:00
|
|
|
Append comma-separated list of keys this quick select uses to key_names;
|
|
|
|
|
append comma-separated list of corresponding used lengths to used_lengths.
|
2004-05-12 23:38:40 +02:00
|
|
|
This is used by select_describe.
|
|
|
|
|
*/
|
2004-07-21 00:45:08 +02:00
|
|
|
virtual void add_keys_and_lengths(String *key_names,
|
2004-05-29 00:04:01 +02:00
|
|
|
String *used_lengths)=0;
|
2004-07-21 00:45:08 +02:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
Append text representation of quick select structure (what and how is
|
2004-05-29 00:04:01 +02:00
|
|
|
merged) to str. The result is added to "Extra" field in EXPLAIN output.
|
|
|
|
|
This function is implemented only by quick selects that merge other quick
|
|
|
|
|
selects output and/or can produce output suitable for merging.
|
|
|
|
|
*/
|
|
|
|
|
virtual void add_info_string(String *str) {};
|
|
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
Return 1 if any index used by this quick select
|
2006-09-21 11:39:29 +02:00
|
|
|
uses field which is marked in passed bitmap.
|
2004-05-29 00:04:01 +02:00
|
|
|
*/
|
2006-09-21 11:39:29 +02:00
|
|
|
virtual bool is_keys_used(const MY_BITMAP *fields);
|
2004-05-12 23:38:40 +02:00
|
|
|
|
|
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
rowid of last row retrieved by this quick select. This is used only when
|
|
|
|
|
doing ROR-index_merge selects
|
2004-05-12 23:38:40 +02:00
|
|
|
*/
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *last_rowid;
|
2004-05-29 00:04:01 +02:00
|
|
|
|
|
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
Table record buffer used by this quick select.
|
2004-05-29 00:04:01 +02:00
|
|
|
*/
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *record;
|
2004-05-12 23:38:40 +02:00
|
|
|
#ifndef DBUG_OFF
|
|
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
Print quick select information to DBUG_FILE. Caller is responsible
|
2004-05-12 23:38:40 +02:00
|
|
|
for locking DBUG_FILE before this call and unlocking it afterwards.
|
|
|
|
|
*/
|
|
|
|
|
virtual void dbug_dump(int indent, bool verbose)= 0;
|
2004-07-21 00:45:08 +02:00
|
|
|
#endif
|
2003-11-13 15:52:02 +01:00
|
|
|
};
|
|
|
|
|
|
2004-05-12 23:38:40 +02:00
|
|
|
|
2003-11-13 15:52:02 +01:00
|
|
|
struct st_qsel_param;
|
2005-12-22 10:29:00 +01:00
|
|
|
class PARAM;
|
2003-11-13 15:52:02 +01:00
|
|
|
class SEL_ARG;
|
|
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
/*
|
2004-07-21 00:45:08 +02:00
|
|
|
Quick select that does a range scan on a single key. The records are
|
2004-05-29 00:04:01 +02:00
|
|
|
returned in key order.
|
|
|
|
|
*/
|
2004-05-12 23:38:40 +02:00
|
|
|
class QUICK_RANGE_SELECT : public QUICK_SELECT_I
|
2003-11-13 15:52:02 +01:00
|
|
|
{
|
|
|
|
|
protected:
|
This changeset is largely a handler cleanup changeset (WL#3281), but includes fixes and cleanups that was found necessary while testing the handler changes
Changes that requires code changes in other code of other storage engines.
(Note that all changes are very straightforward and one should find all issues
by compiling a --debug build and fixing all compiler errors and all
asserts in field.cc while running the test suite),
- New optional handler function introduced: reset()
This is called after every DML statement to make it easy for a handler to
statement specific cleanups.
(The only case it's not called is if force the file to be closed)
- handler::extra(HA_EXTRA_RESET) is removed. Code that was there before
should be moved to handler::reset()
- table->read_set contains a bitmap over all columns that are needed
in the query. read_row() and similar functions only needs to read these
columns
- table->write_set contains a bitmap over all columns that will be updated
in the query. write_row() and update_row() only needs to update these
columns.
The above bitmaps should now be up to date in all context
(including ALTER TABLE, filesort()).
The handler is informed of any changes to the bitmap after
fix_fields() by calling the virtual function
handler::column_bitmaps_signal(). If the handler does caching of
these bitmaps (instead of using table->read_set, table->write_set),
it should redo the caching in this code. as the signal() may be sent
several times, it's probably best to set a variable in the signal
and redo the caching on read_row() / write_row() if the variable was
set.
- Removed the read_set and write_set bitmap objects from the handler class
- Removed all column bit handling functions from the handler class.
(Now one instead uses the normal bitmap functions in my_bitmap.c instead
of handler dedicated bitmap functions)
- field->query_id is removed. One should instead instead check
table->read_set and table->write_set if a field is used in the query.
- handler::extra(HA_EXTRA_RETRIVE_ALL_COLS) and
handler::extra(HA_EXTRA_RETRIEVE_PRIMARY_KEY) are removed. One should now
instead use table->read_set to check for which columns to retrieve.
- If a handler needs to call Field->val() or Field->store() on columns
that are not used in the query, one should install a temporary
all-columns-used map while doing so. For this, we provide the following
functions:
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->read_set);
field->val();
dbug_tmp_restore_column_map(table->read_set, old_map);
and similar for the write map:
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->write_set);
field->val();
dbug_tmp_restore_column_map(table->write_set, old_map);
If this is not done, you will sooner or later hit a DBUG_ASSERT
in the field store() / val() functions.
(For not DBUG binaries, the dbug_tmp_restore_column_map() and
dbug_tmp_restore_column_map() are inline dummy functions and should
be optimized away be the compiler).
- If one needs to temporary set the column map for all binaries (and not
just to avoid the DBUG_ASSERT() in the Field::store() / Field::val()
methods) one should use the functions tmp_use_all_columns() and
tmp_restore_column_map() instead of the above dbug_ variants.
- All 'status' fields in the handler base class (like records,
data_file_length etc) are now stored in a 'stats' struct. This makes
it easier to know what status variables are provided by the base
handler. This requires some trivial variable names in the extra()
function.
- New virtual function handler::records(). This is called to optimize
COUNT(*) if (handler::table_flags() & HA_HAS_RECORDS()) is true.
(stats.records is not supposed to be an exact value. It's only has to
be 'reasonable enough' for the optimizer to be able to choose a good
optimization path).
- Non virtual handler::init() function added for caching of virtual
constants from engine.
- Removed has_transactions() virtual method. Now one should instead return
HA_NO_TRANSACTIONS in table_flags() if the table handler DOES NOT support
transactions.
- The 'xxxx_create_handler()' function now has a MEM_ROOT_root argument
that is to be used with 'new handler_name()' to allocate the handler
in the right area. The xxxx_create_handler() function is also
responsible for any initialization of the object before returning.
For example, one should change:
static handler *myisam_create_handler(TABLE_SHARE *table)
{
return new ha_myisam(table);
}
->
static handler *myisam_create_handler(TABLE_SHARE *table, MEM_ROOT *mem_root)
{
return new (mem_root) ha_myisam(table);
}
- New optional virtual function: use_hidden_primary_key().
This is called in case of an update/delete when
(table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined
but we don't have a primary key. This allows the handler to take precisions
in remembering any hidden primary key to able to update/delete any
found row. The default handler marks all columns to be read.
- handler::table_flags() now returns a ulonglong (to allow for more flags).
- New/changed table_flags()
- HA_HAS_RECORDS Set if ::records() is supported
- HA_NO_TRANSACTIONS Set if engine doesn't support transactions
- HA_PRIMARY_KEY_REQUIRED_FOR_DELETE
Set if we should mark all primary key columns for
read when reading rows as part of a DELETE
statement. If there is no primary key,
all columns are marked for read.
- HA_PARTIAL_COLUMN_READ Set if engine will not read all columns in some
cases (based on table->read_set)
- HA_PRIMARY_KEY_ALLOW_RANDOM_ACCESS
Renamed to HA_PRIMARY_KEY_REQUIRED_FOR_POSITION.
- HA_DUPP_POS Renamed to HA_DUPLICATE_POS
- HA_REQUIRES_KEY_COLUMNS_FOR_DELETE
Set this if we should mark ALL key columns for
read when when reading rows as part of a DELETE
statement. In case of an update we will mark
all keys for read for which key part changed
value.
- HA_STATS_RECORDS_IS_EXACT
Set this if stats.records is exact.
(This saves us some extra records() calls
when optimizing COUNT(*))
- Removed table_flags()
- HA_NOT_EXACT_COUNT Now one should instead use HA_HAS_RECORDS if
handler::records() gives an exact count() and
HA_STATS_RECORDS_IS_EXACT if stats.records is exact.
- HA_READ_RND_SAME Removed (no one supported this one)
- Removed not needed functions ha_retrieve_all_cols() and ha_retrieve_all_pk()
- Renamed handler::dupp_pos to handler::dup_pos
- Removed not used variable handler::sortkey
Upper level handler changes:
- ha_reset() now does some overall checks and calls ::reset()
- ha_table_flags() added. This is a cached version of table_flags(). The
cache is updated on engine creation time and updated on open.
MySQL level changes (not obvious from the above):
- DBUG_ASSERT() added to check that column usage matches what is set
in the column usage bit maps. (This found a LOT of bugs in current
column marking code).
- In 5.1 before, all used columns was marked in read_set and only updated
columns was marked in write_set. Now we only mark columns for which we
need a value in read_set.
- Column bitmaps are created in open_binary_frm() and open_table_from_share().
(Before this was in table.cc)
- handler::table_flags() calls are replaced with handler::ha_table_flags()
- For calling field->val() you must have the corresponding bit set in
table->read_set. For calling field->store() you must have the
corresponding bit set in table->write_set. (There are asserts in
all store()/val() functions to catch wrong usage)
- thd->set_query_id is renamed to thd->mark_used_columns and instead
of setting this to an integer value, this has now the values:
MARK_COLUMNS_NONE, MARK_COLUMNS_READ, MARK_COLUMNS_WRITE
Changed also all variables named 'set_query_id' to mark_used_columns.
- In filesort() we now inform the handler of exactly which columns are needed
doing the sort and choosing the rows.
- The TABLE_SHARE object has a 'all_set' column bitmap one can use
when one needs a column bitmap with all columns set.
(This is used for table->use_all_columns() and other places)
- The TABLE object has 3 column bitmaps:
- def_read_set Default bitmap for columns to be read
- def_write_set Default bitmap for columns to be written
- tmp_set Can be used as a temporary bitmap when needed.
The table object has also two pointer to bitmaps read_set and write_set
that the handler should use to find out which columns are used in which way.
- count() optimization now calls handler::records() instead of using
handler->stats.records (if (table_flags() & HA_HAS_RECORDS) is true).
- Added extra argument to Item::walk() to indicate if we should also
traverse sub queries.
- Added TABLE parameter to cp_buffer_from_ref()
- Don't close tables created with CREATE ... SELECT but keep them in
the table cache. (Faster usage of newly created tables).
New interfaces:
- table->clear_column_bitmaps() to initialize the bitmaps for tables
at start of new statements.
- table->column_bitmaps_set() to set up new column bitmaps and signal
the handler about this.
- table->column_bitmaps_set_no_signal() for some few cases where we need
to setup new column bitmaps but don't signal the handler (as the handler
has already been signaled about these before). Used for the momement
only in opt_range.cc when doing ROR scans.
- table->use_all_columns() to install a bitmap where all columns are marked
as use in the read and the write set.
- table->default_column_bitmaps() to install the normal read and write
column bitmaps, but not signaling the handler about this.
This is mainly used when creating TABLE instances.
- table->mark_columns_needed_for_delete(),
table->mark_columns_needed_for_delete() and
table->mark_columns_needed_for_insert() to allow us to put additional
columns in column usage maps if handler so requires.
(The handler indicates what it neads in handler->table_flags())
- table->prepare_for_position() to allow us to tell handler that it
needs to read primary key parts to be able to store them in
future table->position() calls.
(This replaces the table->file->ha_retrieve_all_pk function)
- table->mark_auto_increment_column() to tell handler are going to update
columns part of any auto_increment key.
- table->mark_columns_used_by_index() to mark all columns that is part of
an index. It will also send extra(HA_EXTRA_KEYREAD) to handler to allow
it to quickly know that it only needs to read colums that are part
of the key. (The handler can also use the column map for detecting this,
but simpler/faster handler can just monitor the extra() call).
- table->mark_columns_used_by_index_no_reset() to in addition to other columns,
also mark all columns that is used by the given key.
- table->restore_column_maps_after_mark_index() to restore to default
column maps after a call to table->mark_columns_used_by_index().
- New item function register_field_in_read_map(), for marking used columns
in table->read_map. Used by filesort() to mark all used columns
- Maintain in TABLE->merge_keys set of all keys that are used in query.
(Simplices some optimization loops)
- Maintain Field->part_of_key_not_clustered which is like Field->part_of_key
but the field in the clustered key is not assumed to be part of all index.
(used in opt_range.cc for faster loops)
- dbug_tmp_use_all_columns(), dbug_tmp_restore_column_map()
tmp_use_all_columns() and tmp_restore_column_map() functions to temporally
mark all columns as usable. The 'dbug_' version is primarily intended
inside a handler when it wants to just call Field:store() & Field::val()
functions, but don't need the column maps set for any other usage.
(ie:: bitmap_is_set() is never called)
- We can't use compare_records() to skip updates for handlers that returns
a partial column set and the read_set doesn't cover all columns in the
write set. The reason for this is that if we have a column marked only for
write we can't in the MySQL level know if the value changed or not.
The reason this worked before was that MySQL marked all to be written
columns as also to be read. The new 'optimal' bitmaps exposed this 'hidden
bug'.
- open_table_from_share() does not anymore setup temporary MEM_ROOT
object as a thread specific variable for the handler. Instead we
send the to-be-used MEMROOT to get_new_handler().
(Simpler, faster code)
Bugs fixed:
- Column marking was not done correctly in a lot of cases.
(ALTER TABLE, when using triggers, auto_increment fields etc)
(Could potentially result in wrong values inserted in table handlers
relying on that the old column maps or field->set_query_id was correct)
Especially when it comes to triggers, there may be cases where the
old code would cause lost/wrong values for NDB and/or InnoDB tables.
- Split thd->options flag OPTION_STATUS_NO_TRANS_UPDATE to two flags:
OPTION_STATUS_NO_TRANS_UPDATE and OPTION_KEEP_LOG.
This allowed me to remove some wrong warnings about:
"Some non-transactional changed tables couldn't be rolled back"
- Fixed handling of INSERT .. SELECT and CREATE ... SELECT that wrongly reset
(thd->options & OPTION_STATUS_NO_TRANS_UPDATE) which caused us to loose
some warnings about
"Some non-transactional changed tables couldn't be rolled back")
- Fixed use of uninitialized memory in ha_ndbcluster.cc::delete_table()
which could cause delete_table to report random failures.
- Fixed core dumps for some tests when running with --debug
- Added missing FN_LIBCHAR in mysql_rm_tmp_tables()
(This has probably caused us to not properly remove temporary files after
crash)
- slow_logs was not properly initialized, which could maybe cause
extra/lost entries in slow log.
- If we get an duplicate row on insert, change column map to read and
write all columns while retrying the operation. This is required by
the definition of REPLACE and also ensures that fields that are only
part of UPDATE are properly handled. This fixed a bug in NDB and
REPLACE where REPLACE wrongly copied some column values from the replaced
row.
- For table handler that doesn't support NULL in keys, we would give an error
when creating a primary key with NULL fields, even after the fields has been
automaticly converted to NOT NULL.
- Creating a primary key on a SPATIAL key, would fail if field was not
declared as NOT NULL.
Cleanups:
- Removed not used condition argument to setup_tables
- Removed not needed item function reset_query_id_processor().
- Field->add_index is removed. Now this is instead maintained in
(field->flags & FIELD_IN_ADD_INDEX)
- Field->fieldnr is removed (use field->field_index instead)
- New argument to filesort() to indicate that it should return a set of
row pointers (not used columns). This allowed me to remove some references
to sql_command in filesort and should also enable us to return column
results in some cases where we couldn't before.
- Changed column bitmap handling in opt_range.cc to be aligned with TABLE
bitmap, which allowed me to use bitmap functions instead of looping over
all fields to create some needed bitmaps. (Faster and smaller code)
- Broke up found too long lines
- Moved some variable declaration at start of function for better code
readability.
- Removed some not used arguments from functions.
(setup_fields(), mysql_prepare_insert_check_table())
- setup_fields() now takes an enum instead of an int for marking columns
usage.
- For internal temporary tables, use handler::write_row(),
handler::delete_row() and handler::update_row() instead of
handler::ha_xxxx() for faster execution.
- Changed some constants to enum's and define's.
- Using separate column read and write sets allows for easier checking
of timestamp field was set by statement.
- Remove calls to free_io_cache() as this is now done automaticly in ha_reset()
- Don't build table->normalized_path as this is now identical to table->path
(after bar's fixes to convert filenames)
- Fixed some missed DBUG_PRINT(.."%lx") to use "0x%lx" to make it easier to
do comparision with the 'convert-dbug-for-diff' tool.
Things left to do in 5.1:
- We wrongly log failed CREATE TABLE ... SELECT in some cases when using
row based logging (as shown by testcase binlog_row_mix_innodb_myisam.result)
Mats has promised to look into this.
- Test that my fix for CREATE TABLE ... SELECT is indeed correct.
(I added several test cases for this, but in this case it's better that
someone else also tests this throughly).
Lars has promosed to do this.
2006-06-04 17:52:22 +02:00
|
|
|
bool next,dont_free,in_ror_merged_scan;
|
2003-11-13 15:52:02 +01:00
|
|
|
public:
|
2000-07-31 21:29:14 +02:00
|
|
|
int error;
|
2004-05-12 23:38:40 +02:00
|
|
|
protected:
|
2000-07-31 21:29:14 +02:00
|
|
|
handler *file;
|
2004-05-29 00:04:01 +02:00
|
|
|
/*
|
|
|
|
|
If true, this quick select has its "own" handler object which should be
|
|
|
|
|
closed no later then this quick select is deleted.
|
|
|
|
|
*/
|
|
|
|
|
bool free_file;
|
2004-12-23 21:45:10 +01:00
|
|
|
bool in_range;
|
|
|
|
|
uint multi_range_count; /* copy from thd->variables.multi_range_count */
|
|
|
|
|
uint multi_range_length; /* the allocated length for the array */
|
|
|
|
|
uint multi_range_bufsiz; /* copy from thd->variables.read_rnd_buff_size */
|
|
|
|
|
KEY_MULTI_RANGE *multi_range; /* the multi-range array (allocated and
|
|
|
|
|
freed by QUICK_RANGE_SELECT) */
|
|
|
|
|
HANDLER_BUFFER *multi_range_buff; /* the handler buffer (allocated and
|
|
|
|
|
freed by QUICK_RANGE_SELECT) */
|
This changeset is largely a handler cleanup changeset (WL#3281), but includes fixes and cleanups that was found necessary while testing the handler changes
Changes that requires code changes in other code of other storage engines.
(Note that all changes are very straightforward and one should find all issues
by compiling a --debug build and fixing all compiler errors and all
asserts in field.cc while running the test suite),
- New optional handler function introduced: reset()
This is called after every DML statement to make it easy for a handler to
statement specific cleanups.
(The only case it's not called is if force the file to be closed)
- handler::extra(HA_EXTRA_RESET) is removed. Code that was there before
should be moved to handler::reset()
- table->read_set contains a bitmap over all columns that are needed
in the query. read_row() and similar functions only needs to read these
columns
- table->write_set contains a bitmap over all columns that will be updated
in the query. write_row() and update_row() only needs to update these
columns.
The above bitmaps should now be up to date in all context
(including ALTER TABLE, filesort()).
The handler is informed of any changes to the bitmap after
fix_fields() by calling the virtual function
handler::column_bitmaps_signal(). If the handler does caching of
these bitmaps (instead of using table->read_set, table->write_set),
it should redo the caching in this code. as the signal() may be sent
several times, it's probably best to set a variable in the signal
and redo the caching on read_row() / write_row() if the variable was
set.
- Removed the read_set and write_set bitmap objects from the handler class
- Removed all column bit handling functions from the handler class.
(Now one instead uses the normal bitmap functions in my_bitmap.c instead
of handler dedicated bitmap functions)
- field->query_id is removed. One should instead instead check
table->read_set and table->write_set if a field is used in the query.
- handler::extra(HA_EXTRA_RETRIVE_ALL_COLS) and
handler::extra(HA_EXTRA_RETRIEVE_PRIMARY_KEY) are removed. One should now
instead use table->read_set to check for which columns to retrieve.
- If a handler needs to call Field->val() or Field->store() on columns
that are not used in the query, one should install a temporary
all-columns-used map while doing so. For this, we provide the following
functions:
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->read_set);
field->val();
dbug_tmp_restore_column_map(table->read_set, old_map);
and similar for the write map:
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table, table->write_set);
field->val();
dbug_tmp_restore_column_map(table->write_set, old_map);
If this is not done, you will sooner or later hit a DBUG_ASSERT
in the field store() / val() functions.
(For not DBUG binaries, the dbug_tmp_restore_column_map() and
dbug_tmp_restore_column_map() are inline dummy functions and should
be optimized away be the compiler).
- If one needs to temporary set the column map for all binaries (and not
just to avoid the DBUG_ASSERT() in the Field::store() / Field::val()
methods) one should use the functions tmp_use_all_columns() and
tmp_restore_column_map() instead of the above dbug_ variants.
- All 'status' fields in the handler base class (like records,
data_file_length etc) are now stored in a 'stats' struct. This makes
it easier to know what status variables are provided by the base
handler. This requires some trivial variable names in the extra()
function.
- New virtual function handler::records(). This is called to optimize
COUNT(*) if (handler::table_flags() & HA_HAS_RECORDS()) is true.
(stats.records is not supposed to be an exact value. It's only has to
be 'reasonable enough' for the optimizer to be able to choose a good
optimization path).
- Non virtual handler::init() function added for caching of virtual
constants from engine.
- Removed has_transactions() virtual method. Now one should instead return
HA_NO_TRANSACTIONS in table_flags() if the table handler DOES NOT support
transactions.
- The 'xxxx_create_handler()' function now has a MEM_ROOT_root argument
that is to be used with 'new handler_name()' to allocate the handler
in the right area. The xxxx_create_handler() function is also
responsible for any initialization of the object before returning.
For example, one should change:
static handler *myisam_create_handler(TABLE_SHARE *table)
{
return new ha_myisam(table);
}
->
static handler *myisam_create_handler(TABLE_SHARE *table, MEM_ROOT *mem_root)
{
return new (mem_root) ha_myisam(table);
}
- New optional virtual function: use_hidden_primary_key().
This is called in case of an update/delete when
(table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined
but we don't have a primary key. This allows the handler to take precisions
in remembering any hidden primary key to able to update/delete any
found row. The default handler marks all columns to be read.
- handler::table_flags() now returns a ulonglong (to allow for more flags).
- New/changed table_flags()
- HA_HAS_RECORDS Set if ::records() is supported
- HA_NO_TRANSACTIONS Set if engine doesn't support transactions
- HA_PRIMARY_KEY_REQUIRED_FOR_DELETE
Set if we should mark all primary key columns for
read when reading rows as part of a DELETE
statement. If there is no primary key,
all columns are marked for read.
- HA_PARTIAL_COLUMN_READ Set if engine will not read all columns in some
cases (based on table->read_set)
- HA_PRIMARY_KEY_ALLOW_RANDOM_ACCESS
Renamed to HA_PRIMARY_KEY_REQUIRED_FOR_POSITION.
- HA_DUPP_POS Renamed to HA_DUPLICATE_POS
- HA_REQUIRES_KEY_COLUMNS_FOR_DELETE
Set this if we should mark ALL key columns for
read when when reading rows as part of a DELETE
statement. In case of an update we will mark
all keys for read for which key part changed
value.
- HA_STATS_RECORDS_IS_EXACT
Set this if stats.records is exact.
(This saves us some extra records() calls
when optimizing COUNT(*))
- Removed table_flags()
- HA_NOT_EXACT_COUNT Now one should instead use HA_HAS_RECORDS if
handler::records() gives an exact count() and
HA_STATS_RECORDS_IS_EXACT if stats.records is exact.
- HA_READ_RND_SAME Removed (no one supported this one)
- Removed not needed functions ha_retrieve_all_cols() and ha_retrieve_all_pk()
- Renamed handler::dupp_pos to handler::dup_pos
- Removed not used variable handler::sortkey
Upper level handler changes:
- ha_reset() now does some overall checks and calls ::reset()
- ha_table_flags() added. This is a cached version of table_flags(). The
cache is updated on engine creation time and updated on open.
MySQL level changes (not obvious from the above):
- DBUG_ASSERT() added to check that column usage matches what is set
in the column usage bit maps. (This found a LOT of bugs in current
column marking code).
- In 5.1 before, all used columns was marked in read_set and only updated
columns was marked in write_set. Now we only mark columns for which we
need a value in read_set.
- Column bitmaps are created in open_binary_frm() and open_table_from_share().
(Before this was in table.cc)
- handler::table_flags() calls are replaced with handler::ha_table_flags()
- For calling field->val() you must have the corresponding bit set in
table->read_set. For calling field->store() you must have the
corresponding bit set in table->write_set. (There are asserts in
all store()/val() functions to catch wrong usage)
- thd->set_query_id is renamed to thd->mark_used_columns and instead
of setting this to an integer value, this has now the values:
MARK_COLUMNS_NONE, MARK_COLUMNS_READ, MARK_COLUMNS_WRITE
Changed also all variables named 'set_query_id' to mark_used_columns.
- In filesort() we now inform the handler of exactly which columns are needed
doing the sort and choosing the rows.
- The TABLE_SHARE object has a 'all_set' column bitmap one can use
when one needs a column bitmap with all columns set.
(This is used for table->use_all_columns() and other places)
- The TABLE object has 3 column bitmaps:
- def_read_set Default bitmap for columns to be read
- def_write_set Default bitmap for columns to be written
- tmp_set Can be used as a temporary bitmap when needed.
The table object has also two pointer to bitmaps read_set and write_set
that the handler should use to find out which columns are used in which way.
- count() optimization now calls handler::records() instead of using
handler->stats.records (if (table_flags() & HA_HAS_RECORDS) is true).
- Added extra argument to Item::walk() to indicate if we should also
traverse sub queries.
- Added TABLE parameter to cp_buffer_from_ref()
- Don't close tables created with CREATE ... SELECT but keep them in
the table cache. (Faster usage of newly created tables).
New interfaces:
- table->clear_column_bitmaps() to initialize the bitmaps for tables
at start of new statements.
- table->column_bitmaps_set() to set up new column bitmaps and signal
the handler about this.
- table->column_bitmaps_set_no_signal() for some few cases where we need
to setup new column bitmaps but don't signal the handler (as the handler
has already been signaled about these before). Used for the momement
only in opt_range.cc when doing ROR scans.
- table->use_all_columns() to install a bitmap where all columns are marked
as use in the read and the write set.
- table->default_column_bitmaps() to install the normal read and write
column bitmaps, but not signaling the handler about this.
This is mainly used when creating TABLE instances.
- table->mark_columns_needed_for_delete(),
table->mark_columns_needed_for_delete() and
table->mark_columns_needed_for_insert() to allow us to put additional
columns in column usage maps if handler so requires.
(The handler indicates what it neads in handler->table_flags())
- table->prepare_for_position() to allow us to tell handler that it
needs to read primary key parts to be able to store them in
future table->position() calls.
(This replaces the table->file->ha_retrieve_all_pk function)
- table->mark_auto_increment_column() to tell handler are going to update
columns part of any auto_increment key.
- table->mark_columns_used_by_index() to mark all columns that is part of
an index. It will also send extra(HA_EXTRA_KEYREAD) to handler to allow
it to quickly know that it only needs to read colums that are part
of the key. (The handler can also use the column map for detecting this,
but simpler/faster handler can just monitor the extra() call).
- table->mark_columns_used_by_index_no_reset() to in addition to other columns,
also mark all columns that is used by the given key.
- table->restore_column_maps_after_mark_index() to restore to default
column maps after a call to table->mark_columns_used_by_index().
- New item function register_field_in_read_map(), for marking used columns
in table->read_map. Used by filesort() to mark all used columns
- Maintain in TABLE->merge_keys set of all keys that are used in query.
(Simplices some optimization loops)
- Maintain Field->part_of_key_not_clustered which is like Field->part_of_key
but the field in the clustered key is not assumed to be part of all index.
(used in opt_range.cc for faster loops)
- dbug_tmp_use_all_columns(), dbug_tmp_restore_column_map()
tmp_use_all_columns() and tmp_restore_column_map() functions to temporally
mark all columns as usable. The 'dbug_' version is primarily intended
inside a handler when it wants to just call Field:store() & Field::val()
functions, but don't need the column maps set for any other usage.
(ie:: bitmap_is_set() is never called)
- We can't use compare_records() to skip updates for handlers that returns
a partial column set and the read_set doesn't cover all columns in the
write set. The reason for this is that if we have a column marked only for
write we can't in the MySQL level know if the value changed or not.
The reason this worked before was that MySQL marked all to be written
columns as also to be read. The new 'optimal' bitmaps exposed this 'hidden
bug'.
- open_table_from_share() does not anymore setup temporary MEM_ROOT
object as a thread specific variable for the handler. Instead we
send the to-be-used MEMROOT to get_new_handler().
(Simpler, faster code)
Bugs fixed:
- Column marking was not done correctly in a lot of cases.
(ALTER TABLE, when using triggers, auto_increment fields etc)
(Could potentially result in wrong values inserted in table handlers
relying on that the old column maps or field->set_query_id was correct)
Especially when it comes to triggers, there may be cases where the
old code would cause lost/wrong values for NDB and/or InnoDB tables.
- Split thd->options flag OPTION_STATUS_NO_TRANS_UPDATE to two flags:
OPTION_STATUS_NO_TRANS_UPDATE and OPTION_KEEP_LOG.
This allowed me to remove some wrong warnings about:
"Some non-transactional changed tables couldn't be rolled back"
- Fixed handling of INSERT .. SELECT and CREATE ... SELECT that wrongly reset
(thd->options & OPTION_STATUS_NO_TRANS_UPDATE) which caused us to loose
some warnings about
"Some non-transactional changed tables couldn't be rolled back")
- Fixed use of uninitialized memory in ha_ndbcluster.cc::delete_table()
which could cause delete_table to report random failures.
- Fixed core dumps for some tests when running with --debug
- Added missing FN_LIBCHAR in mysql_rm_tmp_tables()
(This has probably caused us to not properly remove temporary files after
crash)
- slow_logs was not properly initialized, which could maybe cause
extra/lost entries in slow log.
- If we get an duplicate row on insert, change column map to read and
write all columns while retrying the operation. This is required by
the definition of REPLACE and also ensures that fields that are only
part of UPDATE are properly handled. This fixed a bug in NDB and
REPLACE where REPLACE wrongly copied some column values from the replaced
row.
- For table handler that doesn't support NULL in keys, we would give an error
when creating a primary key with NULL fields, even after the fields has been
automaticly converted to NOT NULL.
- Creating a primary key on a SPATIAL key, would fail if field was not
declared as NOT NULL.
Cleanups:
- Removed not used condition argument to setup_tables
- Removed not needed item function reset_query_id_processor().
- Field->add_index is removed. Now this is instead maintained in
(field->flags & FIELD_IN_ADD_INDEX)
- Field->fieldnr is removed (use field->field_index instead)
- New argument to filesort() to indicate that it should return a set of
row pointers (not used columns). This allowed me to remove some references
to sql_command in filesort and should also enable us to return column
results in some cases where we couldn't before.
- Changed column bitmap handling in opt_range.cc to be aligned with TABLE
bitmap, which allowed me to use bitmap functions instead of looping over
all fields to create some needed bitmaps. (Faster and smaller code)
- Broke up found too long lines
- Moved some variable declaration at start of function for better code
readability.
- Removed some not used arguments from functions.
(setup_fields(), mysql_prepare_insert_check_table())
- setup_fields() now takes an enum instead of an int for marking columns
usage.
- For internal temporary tables, use handler::write_row(),
handler::delete_row() and handler::update_row() instead of
handler::ha_xxxx() for faster execution.
- Changed some constants to enum's and define's.
- Using separate column read and write sets allows for easier checking
of timestamp field was set by statement.
- Remove calls to free_io_cache() as this is now done automaticly in ha_reset()
- Don't build table->normalized_path as this is now identical to table->path
(after bar's fixes to convert filenames)
- Fixed some missed DBUG_PRINT(.."%lx") to use "0x%lx" to make it easier to
do comparision with the 'convert-dbug-for-diff' tool.
Things left to do in 5.1:
- We wrongly log failed CREATE TABLE ... SELECT in some cases when using
row based logging (as shown by testcase binlog_row_mix_innodb_myisam.result)
Mats has promised to look into this.
- Test that my fix for CREATE TABLE ... SELECT is indeed correct.
(I added several test cases for this, but in this case it's better that
someone else also tests this throughly).
Lars has promosed to do this.
2006-06-04 17:52:22 +02:00
|
|
|
MY_BITMAP column_bitmap, *save_read_set, *save_write_set;
|
2004-05-12 23:38:40 +02:00
|
|
|
|
2004-08-11 14:40:46 +02:00
|
|
|
friend class TRP_ROR_INTERSECT;
|
2003-12-18 04:08:00 +01:00
|
|
|
friend
|
2004-07-21 00:45:08 +02:00
|
|
|
QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
|
2005-04-28 23:16:32 +02:00
|
|
|
struct st_table_ref *ref,
|
|
|
|
|
ha_rows records);
|
2005-12-22 10:29:00 +01:00
|
|
|
friend bool get_quick_keys(PARAM *param,
|
2003-11-13 15:52:02 +01:00
|
|
|
QUICK_RANGE_SELECT *quick,KEY_PART *key,
|
2003-12-18 04:08:00 +01:00
|
|
|
SEL_ARG *key_tree,
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *min_key, uint min_key_flag,
|
|
|
|
|
uchar *max_key, uint max_key_flag);
|
2005-12-22 10:29:00 +01:00
|
|
|
friend QUICK_RANGE_SELECT *get_quick_select(PARAM*,uint idx,
|
2003-11-13 15:52:02 +01:00
|
|
|
SEL_ARG *key_tree,
|
|
|
|
|
MEM_ROOT *alloc);
|
|
|
|
|
friend class QUICK_SELECT_DESC;
|
2003-12-09 21:40:02 +01:00
|
|
|
friend class QUICK_INDEX_MERGE_SELECT;
|
2004-05-12 23:38:40 +02:00
|
|
|
friend class QUICK_ROR_INTERSECT_SELECT;
|
2006-10-16 18:30:19 +02:00
|
|
|
friend class QUICK_GROUP_MIN_MAX_SELECT;
|
2003-12-09 21:40:02 +01:00
|
|
|
|
|
|
|
|
DYNAMIC_ARRAY ranges; /* ordered array of range ptrs */
|
|
|
|
|
QUICK_RANGE **cur_range; /* current element in ranges */
|
2003-11-13 15:52:02 +01:00
|
|
|
|
2006-12-14 23:51:37 +01:00
|
|
|
QUICK_RANGE *last_range;
|
2004-07-21 00:45:08 +02:00
|
|
|
KEY_PART *key_parts;
|
2004-05-16 13:48:32 +02:00
|
|
|
KEY_PART_INFO *key_part_info;
|
2000-07-31 21:29:14 +02:00
|
|
|
int cmp_next(QUICK_RANGE *range);
|
2003-12-09 21:40:02 +01:00
|
|
|
int cmp_prev(QUICK_RANGE *range);
|
|
|
|
|
bool row_in_ranges();
|
2003-11-13 15:52:02 +01:00
|
|
|
public:
|
2004-05-12 23:38:40 +02:00
|
|
|
MEM_ROOT alloc;
|
|
|
|
|
|
2003-11-20 21:27:11 +01:00
|
|
|
QUICK_RANGE_SELECT(THD *thd, TABLE *table,uint index_arg,bool no_alloc=0,
|
2003-11-13 15:52:02 +01:00
|
|
|
MEM_ROOT *parent_alloc=NULL);
|
|
|
|
|
~QUICK_RANGE_SELECT();
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-12-23 21:45:10 +01:00
|
|
|
int init();
|
2004-12-29 14:07:27 +01:00
|
|
|
int reset(void);
|
2003-11-13 15:52:02 +01:00
|
|
|
int get_next();
|
2004-07-15 03:19:07 +02:00
|
|
|
void range_end();
|
2010-05-10 09:23:23 +02:00
|
|
|
int get_next_prefix(uint prefix_length, uint group_key_parts,
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *cur_prefix);
|
2003-11-13 15:52:02 +01:00
|
|
|
bool reverse_sorted() { return 0; }
|
2000-07-31 21:29:14 +02:00
|
|
|
bool unique_key_range();
|
2004-05-29 00:04:01 +02:00
|
|
|
int init_ror_merged_scan(bool reuse_handler);
|
2004-05-12 23:38:40 +02:00
|
|
|
void save_last_pos()
|
2004-08-27 15:37:13 +02:00
|
|
|
{ file->position(record); }
|
2003-11-13 15:52:02 +01:00
|
|
|
int get_type() { return QS_TYPE_RANGE; }
|
2004-05-29 00:04:01 +02:00
|
|
|
void add_keys_and_lengths(String *key_names, String *used_lengths);
|
|
|
|
|
void add_info_string(String *str);
|
2004-05-12 23:38:40 +02:00
|
|
|
#ifndef DBUG_OFF
|
2004-05-29 00:04:01 +02:00
|
|
|
void dbug_dump(int indent, bool verbose);
|
2004-05-12 23:38:40 +02:00
|
|
|
#endif
|
2004-12-29 14:07:27 +01:00
|
|
|
private:
|
2008-08-25 19:02:54 +02:00
|
|
|
/* Default copy ctor used by QUICK_SELECT_DESC */
|
2003-11-13 15:52:02 +01:00
|
|
|
};
|
|
|
|
|
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2004-05-14 16:00:57 +02:00
|
|
|
class QUICK_RANGE_SELECT_GEOM: public QUICK_RANGE_SELECT
|
|
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
QUICK_RANGE_SELECT_GEOM(THD *thd, TABLE *table, uint index_arg,
|
|
|
|
|
bool no_alloc, MEM_ROOT *parent_alloc)
|
|
|
|
|
:QUICK_RANGE_SELECT(thd, table, index_arg, no_alloc, parent_alloc)
|
|
|
|
|
{};
|
|
|
|
|
virtual int get_next();
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
2003-11-13 15:52:02 +01:00
|
|
|
/*
|
2003-12-18 04:08:00 +01:00
|
|
|
QUICK_INDEX_MERGE_SELECT - index_merge access method quick select.
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
QUICK_INDEX_MERGE_SELECT uses
|
2003-12-18 04:08:00 +01:00
|
|
|
* QUICK_RANGE_SELECTs to get rows
|
|
|
|
|
* Unique class to remove duplicate rows
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
INDEX MERGE OPTIMIZER
|
2004-07-21 00:45:08 +02:00
|
|
|
Current implementation doesn't detect all cases where index_merge could
|
2003-12-18 04:08:00 +01:00
|
|
|
be used, in particular:
|
2004-07-21 00:45:08 +02:00
|
|
|
* index_merge will never be used if range scan is possible (even if
|
2003-12-18 04:08:00 +01:00
|
|
|
range scan is more expensive)
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
* index_merge+'using index' is not supported (this the consequence of
|
2003-12-18 04:08:00 +01:00
|
|
|
the above restriction)
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
* If WHERE part contains complex nested AND and OR conditions, some ways
|
2004-07-21 00:45:08 +02:00
|
|
|
to retrieve rows using index_merge will not be considered. The choice
|
|
|
|
|
of read plan may depend on the order of conjuncts/disjuncts in WHERE
|
2003-12-18 04:08:00 +01:00
|
|
|
part of the query, see comments near imerge_list_or_list and
|
|
|
|
|
SEL_IMERGE::or_sel_tree_with_checks functions for details.
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
* There is no "index_merge_ref" method (but index_merge on non-first
|
|
|
|
|
table in join is possible with 'range checked for each record').
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
See comments around SEL_IMERGE class and test_quick_select for more
|
2003-12-18 04:08:00 +01:00
|
|
|
details.
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
ROW RETRIEVAL ALGORITHM
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
index_merge uses Unique class for duplicates removal. index_merge takes
|
|
|
|
|
advantage of Clustered Primary Key (CPK) if the table has one.
|
|
|
|
|
The index_merge algorithm consists of two phases:
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
Phase 1 (implemented in QUICK_INDEX_MERGE_SELECT::prepare_unique):
|
|
|
|
|
prepare()
|
2003-12-09 21:40:02 +01:00
|
|
|
{
|
2003-12-18 04:08:00 +01:00
|
|
|
activate 'index only';
|
|
|
|
|
while(retrieve next row for non-CPK scan)
|
|
|
|
|
{
|
|
|
|
|
if (there is a CPK scan and row will be retrieved by it)
|
|
|
|
|
skip this row;
|
|
|
|
|
else
|
|
|
|
|
put its rowid into Unique;
|
|
|
|
|
}
|
|
|
|
|
deactivate 'index only';
|
2003-12-09 21:40:02 +01:00
|
|
|
}
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
Phase 2 (implemented as sequence of QUICK_INDEX_MERGE_SELECT::get_next
|
|
|
|
|
calls):
|
2003-12-09 21:40:02 +01:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
fetch()
|
|
|
|
|
{
|
|
|
|
|
retrieve all rows from row pointers stored in Unique;
|
|
|
|
|
free Unique;
|
|
|
|
|
retrieve all rows for CPK scan;
|
|
|
|
|
}
|
2003-11-13 15:52:02 +01:00
|
|
|
*/
|
|
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I
|
2003-11-13 15:52:02 +01:00
|
|
|
{
|
2010-06-24 15:21:23 +02:00
|
|
|
Unique *unique;
|
2003-11-13 15:52:02 +01:00
|
|
|
public:
|
|
|
|
|
QUICK_INDEX_MERGE_SELECT(THD *thd, TABLE *table);
|
|
|
|
|
~QUICK_INDEX_MERGE_SELECT();
|
|
|
|
|
|
|
|
|
|
int init();
|
2003-11-18 22:37:17 +01:00
|
|
|
int reset(void);
|
2003-11-13 15:52:02 +01:00
|
|
|
int get_next();
|
|
|
|
|
bool reverse_sorted() { return false; }
|
|
|
|
|
bool unique_key_range() { return false; }
|
|
|
|
|
int get_type() { return QS_TYPE_INDEX_MERGE; }
|
2004-05-29 00:04:01 +02:00
|
|
|
void add_keys_and_lengths(String *key_names, String *used_lengths);
|
|
|
|
|
void add_info_string(String *str);
|
2006-09-21 11:39:29 +02:00
|
|
|
bool is_keys_used(const MY_BITMAP *fields);
|
2004-05-12 23:38:40 +02:00
|
|
|
#ifndef DBUG_OFF
|
2004-05-29 00:04:01 +02:00
|
|
|
void dbug_dump(int indent, bool verbose);
|
2004-05-12 23:38:40 +02:00
|
|
|
#endif
|
2003-11-13 15:52:02 +01:00
|
|
|
|
|
|
|
|
bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
|
|
|
|
|
|
|
|
|
|
/* range quick selects this index_merge read consists of */
|
|
|
|
|
List<QUICK_RANGE_SELECT> quick_selects;
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
/* quick select that uses clustered primary key (NULL if none) */
|
2003-12-09 21:40:02 +01:00
|
|
|
QUICK_RANGE_SELECT* pk_quick_select;
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2003-12-18 04:08:00 +01:00
|
|
|
/* true if this select is currently doing a clustered PK scan */
|
2003-12-09 21:40:02 +01:00
|
|
|
bool doing_pk_scan;
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2003-11-18 22:37:17 +01:00
|
|
|
MEM_ROOT alloc;
|
|
|
|
|
THD *thd;
|
2004-11-21 09:51:19 +01:00
|
|
|
int read_keys_and_merge();
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2010-11-23 11:18:47 +01:00
|
|
|
bool clustered_pk_range() { return test(pk_quick_select); }
|
|
|
|
|
|
2003-12-09 21:40:02 +01:00
|
|
|
/* used to get rows collected in Unique */
|
|
|
|
|
READ_RECORD read_record;
|
2003-11-13 15:52:02 +01:00
|
|
|
};
|
|
|
|
|
|
2004-05-12 23:38:40 +02:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
Rowid-Ordered Retrieval (ROR) index intersection quick select.
|
2004-07-21 00:45:08 +02:00
|
|
|
This quick select produces intersection of row sequences returned
|
2004-05-29 00:04:01 +02:00
|
|
|
by several QUICK_RANGE_SELECTs it "merges".
|
2004-07-21 00:45:08 +02:00
|
|
|
|
|
|
|
|
All merged QUICK_RANGE_SELECTs must return rowids in rowid order.
|
2004-05-29 00:04:01 +02:00
|
|
|
QUICK_ROR_INTERSECT_SELECT will return rows in rowid order, too.
|
|
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
All merged quick selects retrieve {rowid, covered_fields} tuples (not full
|
2004-05-29 00:04:01 +02:00
|
|
|
table records).
|
2004-07-21 00:45:08 +02:00
|
|
|
QUICK_ROR_INTERSECT_SELECT retrieves full records if it is not being used
|
|
|
|
|
by QUICK_ROR_INTERSECT_SELECT and all merged quick selects together don't
|
2004-05-29 00:04:01 +02:00
|
|
|
cover needed all fields.
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
If one of the merged quick selects is a Clustered PK range scan, it is
|
|
|
|
|
used only to filter rowid sequence produced by other merged quick selects.
|
2004-05-12 23:38:40 +02:00
|
|
|
*/
|
2004-05-29 00:04:01 +02:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
class QUICK_ROR_INTERSECT_SELECT : public QUICK_SELECT_I
|
2004-05-12 23:38:40 +02:00
|
|
|
{
|
|
|
|
|
public:
|
2004-07-21 00:45:08 +02:00
|
|
|
QUICK_ROR_INTERSECT_SELECT(THD *thd, TABLE *table,
|
2004-05-12 23:38:40 +02:00
|
|
|
bool retrieve_full_rows,
|
|
|
|
|
MEM_ROOT *parent_alloc);
|
|
|
|
|
~QUICK_ROR_INTERSECT_SELECT();
|
|
|
|
|
|
|
|
|
|
int init();
|
|
|
|
|
int reset(void);
|
|
|
|
|
int get_next();
|
|
|
|
|
bool reverse_sorted() { return false; }
|
|
|
|
|
bool unique_key_range() { return false; }
|
|
|
|
|
int get_type() { return QS_TYPE_ROR_INTERSECT; }
|
2004-05-29 00:04:01 +02:00
|
|
|
void add_keys_and_lengths(String *key_names, String *used_lengths);
|
|
|
|
|
void add_info_string(String *str);
|
2006-09-21 11:39:29 +02:00
|
|
|
bool is_keys_used(const MY_BITMAP *fields);
|
2004-05-12 23:38:40 +02:00
|
|
|
#ifndef DBUG_OFF
|
2004-05-29 00:04:01 +02:00
|
|
|
void dbug_dump(int indent, bool verbose);
|
2004-05-12 23:38:40 +02:00
|
|
|
#endif
|
2004-05-29 00:04:01 +02:00
|
|
|
int init_ror_merged_scan(bool reuse_handler);
|
2004-05-12 23:38:40 +02:00
|
|
|
bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
|
|
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
/*
|
2004-05-29 00:04:01 +02:00
|
|
|
Range quick selects this intersection consists of, not including
|
|
|
|
|
cpk_quick.
|
|
|
|
|
*/
|
2004-05-12 23:38:40 +02:00
|
|
|
List<QUICK_RANGE_SELECT> quick_selects;
|
2004-07-21 00:45:08 +02:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
Merged quick select that uses Clustered PK, if there is one. This quick
|
2004-05-29 00:04:01 +02:00
|
|
|
select is not used for row retrieval, it is used for row retrieval.
|
|
|
|
|
*/
|
2004-05-12 23:38:40 +02:00
|
|
|
QUICK_RANGE_SELECT *cpk_quick;
|
2004-05-29 00:04:01 +02:00
|
|
|
|
|
|
|
|
MEM_ROOT alloc; /* Memory pool for this and merged quick selects data. */
|
|
|
|
|
THD *thd; /* current thread */
|
|
|
|
|
bool need_to_fetch_row; /* if true, do retrieve full table records. */
|
2004-11-21 09:51:19 +01:00
|
|
|
/* in top-level quick select, true if merged scans where initialized */
|
|
|
|
|
bool scans_inited;
|
2004-05-12 23:38:40 +02:00
|
|
|
};
|
|
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
|
2004-05-12 23:38:40 +02:00
|
|
|
/*
|
|
|
|
|
Rowid-Ordered Retrieval index union select.
|
2004-05-29 00:04:01 +02:00
|
|
|
This quick select produces union of row sequences returned by several
|
|
|
|
|
quick select it "merges".
|
2004-05-12 23:38:40 +02:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
All merged quick selects must return rowids in rowid order.
|
2004-05-29 00:04:01 +02:00
|
|
|
QUICK_ROR_UNION_SELECT will return rows in rowid order, too.
|
|
|
|
|
|
|
|
|
|
All merged quick selects are set not to retrieve full table records.
|
|
|
|
|
ROR-union quick select always retrieves full records.
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-05-12 23:38:40 +02:00
|
|
|
*/
|
2004-05-29 00:04:01 +02:00
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
class QUICK_ROR_UNION_SELECT : public QUICK_SELECT_I
|
2004-05-12 23:38:40 +02:00
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
QUICK_ROR_UNION_SELECT(THD *thd, TABLE *table);
|
|
|
|
|
~QUICK_ROR_UNION_SELECT();
|
|
|
|
|
|
|
|
|
|
int init();
|
|
|
|
|
int reset(void);
|
|
|
|
|
int get_next();
|
|
|
|
|
bool reverse_sorted() { return false; }
|
|
|
|
|
bool unique_key_range() { return false; }
|
|
|
|
|
int get_type() { return QS_TYPE_ROR_UNION; }
|
2004-05-29 00:04:01 +02:00
|
|
|
void add_keys_and_lengths(String *key_names, String *used_lengths);
|
|
|
|
|
void add_info_string(String *str);
|
2006-09-21 11:39:29 +02:00
|
|
|
bool is_keys_used(const MY_BITMAP *fields);
|
2004-05-12 23:38:40 +02:00
|
|
|
#ifndef DBUG_OFF
|
2004-05-29 00:04:01 +02:00
|
|
|
void dbug_dump(int indent, bool verbose);
|
2004-05-12 23:38:40 +02:00
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
bool push_quick_back(QUICK_SELECT_I *quick_sel_range);
|
|
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
List<QUICK_SELECT_I> quick_selects; /* Merged quick selects */
|
2004-07-21 00:45:08 +02:00
|
|
|
|
2004-05-29 00:04:01 +02:00
|
|
|
QUEUE queue; /* Priority queue for merge operation */
|
|
|
|
|
MEM_ROOT alloc; /* Memory pool for this and merged quick selects data. */
|
|
|
|
|
|
|
|
|
|
THD *thd; /* current thread */
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *cur_rowid; /* buffer used in get_next() */
|
|
|
|
|
uchar *prev_rowid; /* rowid of last row returned by get_next() */
|
2004-05-29 00:04:01 +02:00
|
|
|
bool have_prev_rowid; /* true if prev_rowid has valid data */
|
2004-07-21 00:45:08 +02:00
|
|
|
uint rowid_length; /* table rowid length */
|
2004-05-12 23:38:40 +02:00
|
|
|
private:
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
static int queue_cmp(void *arg, uchar *val1, uchar *val2);
|
2004-11-21 09:51:19 +01:00
|
|
|
bool scans_inited;
|
2004-05-12 23:38:40 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
2004-08-27 15:37:13 +02:00
|
|
|
/*
|
|
|
|
|
Index scan for GROUP-BY queries with MIN/MAX aggregate functions.
|
|
|
|
|
|
|
|
|
|
This class provides a specialized index access method for GROUP-BY queries
|
|
|
|
|
of the forms:
|
|
|
|
|
|
|
|
|
|
SELECT A_1,...,A_k, [B_1,...,B_m], [MIN(C)], [MAX(C)]
|
|
|
|
|
FROM T
|
|
|
|
|
WHERE [RNG(A_1,...,A_p ; where p <= k)]
|
|
|
|
|
[AND EQ(B_1,...,B_m)]
|
|
|
|
|
[AND PC(C)]
|
|
|
|
|
[AND PA(A_i1,...,A_iq)]
|
|
|
|
|
GROUP BY A_1,...,A_k;
|
|
|
|
|
|
|
|
|
|
or
|
|
|
|
|
|
|
|
|
|
SELECT DISTINCT A_i1,...,A_ik
|
|
|
|
|
FROM T
|
|
|
|
|
WHERE [RNG(A_1,...,A_p ; where p <= k)]
|
|
|
|
|
[AND PA(A_i1,...,A_iq)];
|
|
|
|
|
|
|
|
|
|
where all selected fields are parts of the same index.
|
|
|
|
|
The class of queries that can be processed by this quick select is fully
|
|
|
|
|
specified in the description of get_best_trp_group_min_max() in opt_range.cc.
|
|
|
|
|
|
|
|
|
|
The get_next() method directly produces result tuples, thus obviating the
|
|
|
|
|
need to call end_send_group() because all grouping is already done inside
|
|
|
|
|
get_next().
|
|
|
|
|
|
|
|
|
|
Since one of the requirements is that all select fields are part of the same
|
|
|
|
|
index, this class produces only index keys, and not complete records.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
class QUICK_GROUP_MIN_MAX_SELECT : public QUICK_SELECT_I
|
|
|
|
|
{
|
|
|
|
|
private:
|
2010-06-24 15:21:23 +02:00
|
|
|
handler * const file; /* The handler used to get data. */
|
2004-08-27 15:37:13 +02:00
|
|
|
JOIN *join; /* Descriptor of the current query */
|
|
|
|
|
KEY *index_info; /* The index chosen for data access */
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *record; /* Buffer where the next record is returned. */
|
|
|
|
|
uchar *tmp_record; /* Temporary storage for next_min(), next_max(). */
|
|
|
|
|
uchar *group_prefix; /* Key prefix consisting of the GROUP fields. */
|
2010-05-10 09:23:23 +02:00
|
|
|
const uint group_prefix_len; /* Length of the group prefix. */
|
2007-03-17 00:13:25 +01:00
|
|
|
uint group_key_parts; /* A number of keyparts in the group prefix */
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *last_prefix; /* Prefix of the last group for detecting EOF. */
|
2004-08-27 15:37:13 +02:00
|
|
|
bool have_min; /* Specify whether we are computing */
|
|
|
|
|
bool have_max; /* a MIN, a MAX, or both. */
|
|
|
|
|
bool seen_first_key; /* Denotes whether the first key was retrieved.*/
|
|
|
|
|
KEY_PART_INFO *min_max_arg_part; /* The keypart of the only argument field */
|
|
|
|
|
/* of all MIN/MAX functions. */
|
|
|
|
|
uint min_max_arg_len; /* The length of the MIN/MAX argument field */
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
uchar *key_infix; /* Infix of constants from equality predicates. */
|
2004-08-27 15:37:13 +02:00
|
|
|
uint key_infix_len;
|
|
|
|
|
DYNAMIC_ARRAY min_max_ranges; /* Array of range ptrs for the MIN/MAX field. */
|
|
|
|
|
uint real_prefix_len; /* Length of key prefix extended with key_infix. */
|
2007-03-17 00:13:25 +01:00
|
|
|
uint real_key_parts; /* A number of keyparts in the above value. */
|
2004-08-27 15:37:13 +02:00
|
|
|
List<Item_sum> *min_functions;
|
|
|
|
|
List<Item_sum> *max_functions;
|
|
|
|
|
List_iterator<Item_sum> *min_functions_it;
|
|
|
|
|
List_iterator<Item_sum> *max_functions_it;
|
|
|
|
|
public:
|
|
|
|
|
/*
|
|
|
|
|
The following two members are public to allow easy access from
|
|
|
|
|
TRP_GROUP_MIN_MAX::make_quick()
|
|
|
|
|
*/
|
|
|
|
|
MEM_ROOT alloc; /* Memory pool for this and quick_prefix_select data. */
|
|
|
|
|
QUICK_RANGE_SELECT *quick_prefix_select;/* For retrieval of group prefixes. */
|
|
|
|
|
private:
|
|
|
|
|
int next_prefix();
|
|
|
|
|
int next_min_in_range();
|
|
|
|
|
int next_max_in_range();
|
|
|
|
|
int next_min();
|
|
|
|
|
int next_max();
|
|
|
|
|
void update_min_result();
|
|
|
|
|
void update_max_result();
|
|
|
|
|
public:
|
|
|
|
|
QUICK_GROUP_MIN_MAX_SELECT(TABLE *table, JOIN *join, bool have_min,
|
|
|
|
|
bool have_max, KEY_PART_INFO *min_max_arg_part,
|
2007-01-29 10:40:26 +01:00
|
|
|
uint group_prefix_len, uint group_key_parts,
|
|
|
|
|
uint used_key_parts, KEY *index_info, uint
|
|
|
|
|
use_index, double read_cost, ha_rows records, uint
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
key_infix_len, uchar *key_infix, MEM_ROOT
|
2007-01-29 10:40:26 +01:00
|
|
|
*parent_alloc);
|
2004-08-27 15:37:13 +02:00
|
|
|
~QUICK_GROUP_MIN_MAX_SELECT();
|
|
|
|
|
bool add_range(SEL_ARG *sel_range);
|
|
|
|
|
void update_key_stat();
|
2006-10-16 18:30:19 +02:00
|
|
|
void adjust_prefix_ranges();
|
2004-08-27 15:37:13 +02:00
|
|
|
bool alloc_buffers();
|
|
|
|
|
int init();
|
|
|
|
|
int reset();
|
|
|
|
|
int get_next();
|
|
|
|
|
bool reverse_sorted() { return false; }
|
|
|
|
|
bool unique_key_range() { return false; }
|
|
|
|
|
int get_type() { return QS_TYPE_GROUP_MIN_MAX; }
|
|
|
|
|
void add_keys_and_lengths(String *key_names, String *used_lengths);
|
|
|
|
|
#ifndef DBUG_OFF
|
|
|
|
|
void dbug_dump(int indent, bool verbose);
|
|
|
|
|
#endif
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
2003-11-13 15:52:02 +01:00
|
|
|
class QUICK_SELECT_DESC: public QUICK_RANGE_SELECT
|
2001-06-28 09:06:23 +02:00
|
|
|
{
|
|
|
|
|
public:
|
2003-11-13 15:52:02 +01:00
|
|
|
QUICK_SELECT_DESC(QUICK_RANGE_SELECT *q, uint used_key_parts);
|
2001-06-28 09:06:23 +02:00
|
|
|
int get_next();
|
2002-03-02 08:51:24 +01:00
|
|
|
bool reverse_sorted() { return 1; }
|
2003-11-13 15:52:02 +01:00
|
|
|
int get_type() { return QS_TYPE_RANGE_DESC; }
|
2001-06-28 09:06:23 +02:00
|
|
|
private:
|
|
|
|
|
bool range_reads_after_key(QUICK_RANGE *range);
|
2006-07-15 09:28:21 +02:00
|
|
|
int reset(void) { rev_it.rewind(); return QUICK_RANGE_SELECT::reset(); }
|
2001-06-28 09:06:23 +02:00
|
|
|
List<QUICK_RANGE> rev_ranges;
|
|
|
|
|
List_iterator<QUICK_RANGE> rev_it;
|
2008-07-16 11:31:50 +02:00
|
|
|
uint used_key_parts;
|
2001-06-28 09:06:23 +02:00
|
|
|
};
|
|
|
|
|
|
2002-03-02 08:51:24 +01:00
|
|
|
|
2000-07-31 21:29:14 +02:00
|
|
|
class SQL_SELECT :public Sql_alloc {
|
|
|
|
|
public:
|
2003-11-13 15:52:02 +01:00
|
|
|
QUICK_SELECT_I *quick; // If quick-select used
|
2000-07-31 21:29:14 +02:00
|
|
|
COND *cond; // where condition
|
|
|
|
|
TABLE *head;
|
|
|
|
|
IO_CACHE file; // Positions to used records
|
|
|
|
|
ha_rows records; // Records in use if read from file
|
|
|
|
|
double read_time; // Time to read rows
|
|
|
|
|
key_map quick_keys; // Possible quick keys
|
|
|
|
|
key_map needed_reg; // Possible quick keys after prev tables.
|
|
|
|
|
table_map const_tables,read_tables;
|
|
|
|
|
bool free_cond;
|
|
|
|
|
|
|
|
|
|
SQL_SELECT();
|
|
|
|
|
~SQL_SELECT();
|
2004-02-05 10:22:08 +01:00
|
|
|
void cleanup();
|
2003-10-15 21:40:36 +02:00
|
|
|
bool check_quick(THD *thd, bool force_quick_range, ha_rows limit)
|
2005-06-03 22:46:03 +02:00
|
|
|
{
|
|
|
|
|
key_map tmp;
|
|
|
|
|
tmp.set_all();
|
|
|
|
|
return test_quick_select(thd, tmp, 0, limit, force_quick_range) < 0;
|
|
|
|
|
}
|
2010-07-19 11:03:52 +02:00
|
|
|
inline bool skip_record(THD *thd, bool *skip_record)
|
|
|
|
|
{
|
|
|
|
|
*skip_record= cond ? cond->val_int() == FALSE : FALSE;
|
|
|
|
|
return thd->is_error();
|
|
|
|
|
}
|
2003-10-11 21:00:24 +02:00
|
|
|
int test_quick_select(THD *thd, key_map keys, table_map prev_tables,
|
2005-06-03 22:46:03 +02:00
|
|
|
ha_rows limit, bool force_quick_range);
|
2000-07-31 21:29:14 +02:00
|
|
|
};
|
|
|
|
|
|
2004-02-03 11:35:24 +01:00
|
|
|
|
2004-02-11 18:21:55 +01:00
|
|
|
class FT_SELECT: public QUICK_RANGE_SELECT {
|
2004-02-03 11:35:24 +01:00
|
|
|
public:
|
2004-02-11 18:21:55 +01:00
|
|
|
FT_SELECT(THD *thd, TABLE *table, uint key) :
|
2006-01-03 17:54:54 +01:00
|
|
|
QUICK_RANGE_SELECT (thd, table, key, 1) { VOID(init()); }
|
2004-07-15 17:30:55 +02:00
|
|
|
~FT_SELECT() { file->ft_end(); }
|
2004-02-11 18:21:55 +01:00
|
|
|
int init() { return error=file->ft_init(); }
|
2004-12-29 14:07:27 +01:00
|
|
|
int reset() { return 0; }
|
2004-02-11 18:21:55 +01:00
|
|
|
int get_next() { return error=file->ft_read(record); }
|
|
|
|
|
int get_type() { return QS_TYPE_FULLTEXT; }
|
2004-02-03 11:35:24 +01:00
|
|
|
};
|
|
|
|
|
|
2004-07-21 00:45:08 +02:00
|
|
|
QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
|
2005-04-28 23:16:32 +02:00
|
|
|
struct st_table_ref *ref,
|
|
|
|
|
ha_rows records);
|
2005-09-30 13:21:37 +02:00
|
|
|
uint get_index_for_order(TABLE *table, ORDER *order, ha_rows limit);
|
|
|
|
|
|
2005-12-22 10:29:00 +01:00
|
|
|
#ifdef WITH_PARTITION_STORAGE_ENGINE
|
|
|
|
|
bool prune_partitions(THD *thd, TABLE *table, Item *pprune_cond);
|
WL#3817: Simplify string / memory area types and make things more consistent (first part)
The following type conversions was done:
- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t
Removed declaration of byte, gptr, my_string, my_size_t and size_s.
Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
as this requires fewer casts in the code and is more in line with how the
standard functions work.
- Added extra length argument to dirname_part() to return the length of the
created string.
- Changed (at least) following functions to take uchar* as argument:
- db_dump()
- my_net_write()
- net_write_command()
- net_store_data()
- DBUG_DUMP()
- decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
argument to my_uncompress() from a pointer to a value as we only return
one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.
Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
explicitely as this conflict was often hided by casting the function to
hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
size_t. This was needed to properly detect errors (which are
returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
(portability fix)
- Removed windows specific code to restore cursor position as this
causes slowdown on windows and we should not mix read() and pread()
calls anyway as this is not thread safe. Updated function comment to
reflect this. Changed function that depended on original behavior of
my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
m_size is the number of elements in the array, not a string/memory
length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
- Replaced some calls to alloc_root + memcpy to use
strmake_root()/strdup_root().
- Changed some calls from memdup() to strmake() (Safety fix)
- Simpler loops in client-simple.c
2007-05-10 11:59:39 +02:00
|
|
|
void store_key_image_to_rec(Field *field, uchar *ptr, uint len);
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2005-12-22 10:29:00 +01:00
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#endif
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2000-07-31 21:29:14 +02:00
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#endif
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