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mariadb/include/myisam.h
Monty b66cdbd1ea Changing all cost calculation to be given in milliseconds 
This makes it easier to compare different costs and also allows
the optimizer to optimizer different storage engines more reliably.

- Added tests/check_costs.pl, a tool to verify optimizer cost calculations.
  - Most engine costs has been found with this program. All steps to
    calculate the new costs are documented in Docs/optimizer_costs.txt

- User optimizer_cost variables are given in microseconds (as individual
  costs can be very small). Internally they are stored in ms.
- Changed DISK_READ_COST (was DISK_SEEK_BASE_COST) from a hard disk cost
  (9 ms) to common SSD cost (400MB/sec).
- Removed cost calculations for hard disks (rotation etc).
- Changed the following handler functions to return IO_AND_CPU_COST.
  This makes it easy to apply different cost modifiers in ha_..time()
  functions for io and cpu costs.
  - scan_time()
  - rnd_pos_time() & rnd_pos_call_time()
  - keyread_time()
- Enhanched keyread_time() to calculate the full cost of reading of a set
  of keys with a given number of ranges and optional number of blocks that
  need to be accessed.
- Removed read_time() as keyread_time() + rnd_pos_time() can do the same
  thing and more.
- Tuned cost for: heap, myisam, Aria, InnoDB, archive and MyRocks.
  Used heap table costs for json_table. The rest are using default engine
  costs.
- Added the following new optimizer variables:
  - optimizer_disk_read_ratio
  - optimizer_disk_read_cost
  - optimizer_key_lookup_cost
  - optimizer_row_lookup_cost
  - optimizer_row_next_find_cost
  - optimizer_scan_cost
- Moved all engine specific cost to OPTIMIZER_COSTS structure.
- Changed costs to use 'records_out' instead of 'records_read' when
  recalculating costs.
- Split optimizer_costs.h to optimizer_costs.h and optimizer_defaults.h.
  This allows one to change costs without having to compile a lot of
  files.
- Updated costs for filter lookup.
- Use a better cost estimate in best_extension_by_limited_search()
  for the sorting cost.
- Fixed previous issues with 'filtered' explain column as we are now
  using 'records_out' (min rows seen for table) to calculate filtering.
  This greatly simplifies the filtering code in
  JOIN_TAB::save_explain_data().

This change caused a lot of queries to be optimized differently than
before, which exposed different issues in the optimizer that needs to
be fixed.  These fixes are in the following commits.  To not have to
change the same test case over and over again, the changes in the test
cases are done in a single commit after all the critical change sets
are done.

InnoDB changes:
- Updated InnoDB to not divide big range cost with 2.
- Added cost for InnoDB (innobase_update_optimizer_costs()).
- Don't mark clustered primary key with HA_KEYREAD_ONLY. This will
  prevent that the optimizer is trying to use index-only scans on
  the clustered key.
- Disabled ha_innobase::scan_time() and ha_innobase::read_time() and
  ha_innobase::rnd_pos_time() as the default engine cost functions now
  works good for InnoDB.

Other things:
- Added  --show-query-costs (\Q) option to mysql.cc to show the query
  cost after each query (good when working with query costs).
- Extended my_getopt with GET_ADJUSTED_VALUE which allows one to adjust
  the value that user is given. This is used to change cost from
  microseconds (user input) to milliseconds (what the server is
  internally using).
- Added include/my_tracker.h  ; Useful include file to quickly test
  costs of a function.
- Use handler::set_table() in all places instead of 'table= arg'.
- Added SHOW_OPTIMIZER_COSTS to sys variables. These are input and
  shown in microseconds for the user but stored as milliseconds.
  This is to make the numbers easier to read for the user (less
  pre-zeros).  Implemented in 'Sys_var_optimizer_cost' class.
- In test_quick_select() do not use index scans if 'no_keyread' is set
  for the table. This is what we do in other places of the server.
- Added THD parameter to Unique::get_use_cost() and
  check_index_intersect_extension() and similar functions to be able
  to provide costs to called functions.
- Changed 'records' to 'rows' in optimizer_trace.
- Write more information to optimizer_trace.
- Added INDEX_BLOCK_FILL_FACTOR_MUL (4) and INDEX_BLOCK_FILL_FACTOR_DIV (3)
  to calculate usage space of keys in b-trees. (Before we used numeric
  constants).
- Removed code that assumed that b-trees has similar costs as binary
  trees. Replaced with engine calls that returns the cost.
- Added Bitmap::find_first_bit()
- Added timings to join_cache for ANALYZE table (patch by Sergei Petrunia).
- Added records_init and records_after_filter to POSITION to remember
  more of what best_access_patch() calculates.
- table_after_join_selectivity() changed to recalculate 'records_out'
  based on the new fields from best_access_patch()

Bug fixes:
- Some queries did not update last_query_cost (was 0). Fixed by moving
  setting thd->...last_query_cost in JOIN::optimize().
- Write '0' as number of rows for const tables with a matching row.

Some internals:
- Engine cost are stored in OPTIMIZER_COSTS structure.  When a
  handlerton is created, we also created a new cost variable for the
  handlerton. We also create a new variable if the user changes a
  optimizer cost for a not yet loaded handlerton either with command
  line arguments or with SET
  @@global.engine.optimizer_cost_variable=xx.
- There are 3 global OPTIMIZER_COSTS variables:
  default_optimizer_costs   The default costs + changes from the
                            command line without an engine specifier.
  heap_optimizer_costs      Heap table costs, used for temporary tables
  tmp_table_optimizer_costs The cost for the default on disk internal
                            temporary table (MyISAM or Aria)
- The engine cost for a table is stored in table_share. To speed up
  accesses the handler has a pointer to this. The cost is copied
  to the table on first access. If one wants to change the cost one
  must first update the global engine cost and then do a FLUSH TABLES.
  This was done to be able to access the costs for an open table
  without any locks.
- When a handlerton is created, the cost are updated the following way:
  See sql/keycaches.cc for details:
  - Use 'default_optimizer_costs' as a base
  - Call hton->update_optimizer_costs() to override with the engines
    default costs.
  - Override the costs that the user has specified for the engine.
  - One handler open, copy the engine cost from handlerton to TABLE_SHARE.
  - Call handler::update_optimizer_costs() to allow the engine to update
    cost for this particular table.
  - There are two costs stored in THD. These are copied to the handler
    when the table is used in a query:
    - optimizer_where_cost
    - optimizer_scan_setup_cost
- Simply code in best_access_path() by storing all cost result in a
  structure. (Idea/Suggestion by Igor)
2023-02-02 23:54:45 +03:00

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/*
Copyright (c) 2000, 2013, Oracle and/or its affiliates.
Copyright (c) 2009, 2013, Monty Program Ab.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/* This file should be included when using myisam_functions */
#ifndef _myisam_h
#define _myisam_h
#ifdef __cplusplus
extern "C" {
#endif
#include <my_base.h>
#include <m_ctype.h>
#include "keycache.h"
#include "my_compare.h"
#include <myisamchk.h>
#include <mysql/plugin.h>
#include <my_check_opt.h>
/*
Limit max keys according to HA_MAX_POSSIBLE_KEY; See myisamchk.h for details
*/
#if MAX_INDEXES > HA_MAX_POSSIBLE_KEY
#define MI_MAX_KEY HA_MAX_POSSIBLE_KEY /* Max allowed keys */
#else
#define MI_MAX_KEY MAX_INDEXES /* Max allowed keys */
#endif
#define MI_MAX_POSSIBLE_KEY_BUFF HA_MAX_POSSIBLE_KEY_BUFF
/*
The following defines can be increased if necessary.
But beware the dependency of MI_MAX_POSSIBLE_KEY_BUFF and MI_MAX_KEY_LENGTH.
*/
#define MI_MAX_KEY_LENGTH 1000 /* Max length in bytes */
#define MI_MAX_KEY_SEG 16 /* Max segments for key */
#define MI_NAME_IEXT ".MYI"
#define MI_NAME_DEXT ".MYD"
/* Possible values for myisam_block_size (must be power of 2) */
#define MI_KEY_BLOCK_LENGTH 1024 /* default key block length */
#define MI_MIN_KEY_BLOCK_LENGTH 1024 /* Min key block length */
#define MI_MAX_KEY_BLOCK_LENGTH 16384
/*
In the following macros '_keyno_' is 0 .. keys-1.
If there can be more keys than bits in the key_map, the highest bit
is for all upper keys. They cannot be switched individually.
This means that clearing of high keys is ignored, setting one high key
sets all high keys.
*/
#define MI_KEYMAP_BITS (8 * SIZEOF_LONG_LONG)
#define MI_KEYMAP_HIGH_MASK (1ULL << (MI_KEYMAP_BITS - 1))
#define mi_get_mask_all_keys_active(_keys_) \
(((_keys_) < MI_KEYMAP_BITS) ? \
((1ULL << (_keys_)) - 1ULL) : \
(~ 0ULL))
#if MI_MAX_KEY > MI_KEYMAP_BITS
#define mi_is_key_active(_keymap_,_keyno_) \
(((_keyno_) < MI_KEYMAP_BITS) ? \
MY_TEST((_keymap_) & (1ULL << (_keyno_))) : \
MY_TEST((_keymap_) & MI_KEYMAP_HIGH_MASK))
#define mi_set_key_active(_keymap_,_keyno_) \
(_keymap_)|= (((_keyno_) < MI_KEYMAP_BITS) ? \
(1ULL << (_keyno_)) : \
MI_KEYMAP_HIGH_MASK)
#define mi_clear_key_active(_keymap_,_keyno_) \
(_keymap_)&= (((_keyno_) < MI_KEYMAP_BITS) ? \
(~ (1ULL << (_keyno_))) : \
(~ (0ULL)) /*ignore*/ )
#else
#define mi_is_key_active(_keymap_,_keyno_) \
MY_TEST((_keymap_) & (1ULL << (_keyno_)))
#define mi_set_key_active(_keymap_,_keyno_) \
(_keymap_)|= (1ULL << (_keyno_))
#define mi_clear_key_active(_keymap_,_keyno_) \
(_keymap_)&= (~ (1ULL << (_keyno_)))
#endif
#define mi_is_any_key_active(_keymap_) \
MY_TEST((_keymap_))
#define mi_is_all_keys_active(_keymap_,_keys_) \
((_keymap_) == mi_get_mask_all_keys_active(_keys_))
#define mi_set_all_keys_active(_keymap_,_keys_) \
(_keymap_)= mi_get_mask_all_keys_active(_keys_)
#define mi_clear_all_keys_active(_keymap_) \
(_keymap_)= 0
#define mi_intersect_keys_active(_to_,_from_) \
(_to_)&= (_from_)
#define mi_is_any_intersect_keys_active(_keymap1_,_keys_,_keymap2_) \
((_keymap1_) & (_keymap2_) & \
mi_get_mask_all_keys_active(_keys_))
#define mi_copy_keys_active(_to_,_maxkeys_,_from_) \
(_to_)= (mi_get_mask_all_keys_active(_maxkeys_) & \
(_from_))
/* Param to/from mi_info */
typedef struct st_mi_isaminfo /* Struct from h_info */
{
ha_rows records; /* Records in database */
ha_rows deleted; /* Deleted records in database */
my_off_t recpos; /* Pos for last used record */
my_off_t newrecpos; /* Pos if we write new record */
my_off_t dupp_key_pos; /* Position to record with dupp key */
my_off_t data_file_length, /* Length of data file */
max_data_file_length,
index_file_length,
max_index_file_length,
delete_length;
ulong reclength; /* Recordlength */
ulong mean_reclength; /* Mean recordlength (if packed) */
ulonglong auto_increment;
ulonglong key_map; /* Which keys are used */
char *data_file_name, *index_file_name;
uint keys; /* Number of keys in use */
uint options; /* HA_OPTION_... used */
int errkey, /* With key was dupplicated on err */
sortkey; /* clustered by this key */
File filenr; /* (uniq) filenr for datafile */
time_t create_time; /* When table was created */
time_t check_time;
time_t update_time;
uint reflength;
ulong record_offset;
ulong *rec_per_key; /* for sql optimizing */
} MI_ISAMINFO;
typedef struct st_mi_create_info
{
const char *index_file_name, *data_file_name; /* If using symlinks */
ha_rows max_rows;
ha_rows reloc_rows;
ulonglong auto_increment;
ulonglong data_file_length;
ulonglong key_file_length;
uint old_options;
uint16 language;
my_bool with_auto_increment;
} MI_CREATE_INFO;
struct st_myisam_info; /* For reference */
struct st_mi_isam_share;
typedef struct st_myisam_info MI_INFO;
struct st_mi_s_param;
typedef struct st_mi_keydef /* Key definition with open & info */
{
struct st_mi_isam_share *share; /* Pointer to base (set in mi_open) */
uint16 keysegs; /* Number of key-segment */
uint16 flag; /* NOSAME, PACK_USED */
uint8 key_alg; /* BTREE, RTREE */
uint16 block_length; /* Length of keyblock (auto) */
uint16 underflow_block_length; /* When to execute underflow */
uint16 keylength; /* Tot length of keyparts (auto) */
uint16 minlength; /* min length of (packed) key (auto) */
uint16 maxlength; /* max length of (packed) key (auto) */
uint16 block_size_index; /* block_size (auto) */
uint32 version; /* For concurrent read/write */
uint32 ftkey_nr; /* full-text index number */
HA_KEYSEG *seg,*end;
struct st_mysql_ftparser *parser; /* Fulltext [pre]parser */
int (*bin_search)(struct st_myisam_info *info,struct st_mi_keydef *keyinfo,
uchar *page,uchar *key,
uint key_len,uint comp_flag,uchar * *ret_pos,
uchar *buff, my_bool *was_last_key);
uint (*get_key)(struct st_mi_keydef *keyinfo,uint nod_flag,uchar * *page,
uchar *key);
int (*pack_key)(struct st_mi_keydef *keyinfo,uint nod_flag,uchar *next_key,
uchar *org_key, uchar *prev_key, uchar *key,
struct st_mi_s_param *s_temp);
void (*store_key)(struct st_mi_keydef *keyinfo, uchar *key_pos,
struct st_mi_s_param *s_temp);
int (*ck_insert)(struct st_myisam_info *inf, uint k_nr, uchar *k, uint klen);
int (*ck_delete)(struct st_myisam_info *inf, uint k_nr, uchar *k, uint klen);
} MI_KEYDEF;
#define MI_UNIQUE_HASH_LENGTH 4
typedef struct st_unique_def /* Segment definition of unique */
{
uint16 keysegs; /* Number of key-segment */
uchar key; /* Mapped to which key */
uint8 null_are_equal;
HA_KEYSEG *seg,*end;
} MI_UNIQUEDEF;
typedef struct st_mi_decode_tree /* Decode huff-table */
{
uint16 *table;
uint quick_table_bits;
uchar *intervalls;
} MI_DECODE_TREE;
struct st_mi_bit_buff;
/*
Note that null markers should always be first in a row !
When creating a column, one should only specify:
type, length, null_bit and null_pos
*/
typedef struct st_columndef /* column information */
{
enum en_fieldtype type;
uint16 length; /* length of field */
uint32 offset; /* Offset to position in row */
uint8 null_bit; /* If column may be 0 */
uint16 null_pos; /* position for null marker */
#ifndef NOT_PACKED_DATABASES
void (*unpack)(struct st_columndef *rec,struct st_mi_bit_buff *buff,
uchar *start,uchar *end);
enum en_fieldtype base_type;
uint space_length_bits,pack_type;
MI_DECODE_TREE *huff_tree;
#endif
} MI_COLUMNDEF;
extern char * myisam_log_filename; /* Name of logfile */
extern ulong myisam_block_size;
extern ulong myisam_concurrent_insert;
extern my_bool myisam_flush,myisam_delay_key_write,myisam_single_user;
extern my_off_t myisam_max_temp_length;
extern ulong myisam_data_pointer_size;
/* usually used to check if a symlink points into the mysql data home */
/* which is normally forbidden */
extern int (*myisam_test_invalid_symlink)(const char *filename);
extern ulonglong myisam_mmap_size, myisam_mmap_used;
extern mysql_mutex_t THR_LOCK_myisam_mmap;
/* Prototypes for myisam-functions */
extern int mi_close(struct st_myisam_info *file);
extern int mi_delete(struct st_myisam_info *file,const uchar *buff);
extern struct st_myisam_info *mi_open(const char *name,int mode,
uint wait_if_locked);
extern int mi_panic(enum ha_panic_function function);
extern int mi_rfirst(struct st_myisam_info *file,uchar *buf,int inx);
extern int mi_rkey(MI_INFO *info, uchar *buf, int inx, const uchar *key,
key_part_map keypart_map, enum ha_rkey_function search_flag);
extern int mi_rlast(struct st_myisam_info *file,uchar *buf,int inx);
extern int mi_rnext(struct st_myisam_info *file,uchar *buf,int inx);
extern int mi_rnext_same(struct st_myisam_info *info, uchar *buf);
extern int mi_rprev(struct st_myisam_info *file,uchar *buf,int inx);
extern int mi_rrnd(struct st_myisam_info *file,uchar *buf, my_off_t pos);
extern int mi_scan_init(struct st_myisam_info *file);
extern int mi_scan(struct st_myisam_info *file,uchar *buf);
extern int mi_rsame(struct st_myisam_info *file,uchar *record,int inx);
extern int mi_rsame_with_pos(struct st_myisam_info *file,uchar *record,
int inx, my_off_t pos);
extern int mi_update(struct st_myisam_info *file,const uchar *old,
const uchar *new_record);
extern int mi_write(struct st_myisam_info *file,const uchar *buff);
extern my_off_t mi_position(struct st_myisam_info *file);
extern int mi_status(struct st_myisam_info *info, MI_ISAMINFO *x, uint flag);
extern int mi_lock_database(struct st_myisam_info *file,int lock_type);
extern int mi_create(const char *name,uint keys,MI_KEYDEF *keydef,
uint columns, MI_COLUMNDEF *columndef,
uint uniques, MI_UNIQUEDEF *uniquedef,
MI_CREATE_INFO *create_info, uint flags);
extern int mi_delete_table(const char *name);
extern int mi_rename(const char *from, const char *to);
extern int mi_extra(struct st_myisam_info *file,
enum ha_extra_function function,
void *extra_arg);
extern int mi_reset(struct st_myisam_info *file);
extern ha_rows mi_records_in_range(MI_INFO *info,int inx,
const key_range *min_key,
const key_range *max_key,
page_range *pages);
extern int mi_log(int activate_log);
extern int mi_is_changed(struct st_myisam_info *info);
extern int mi_delete_all_rows(struct st_myisam_info *info);
extern ulong _mi_calc_blob_length(uint length , const uchar *pos);
extern uint mi_get_pointer_length(ulonglong file_length, uint def);
extern int mi_make_backup_of_index(struct st_myisam_info *info,
time_t backup_time, myf flags);
#define myisam_max_key_length() HA_MAX_KEY_LENGTH
#define myisam_max_key_segments() HA_MAX_KEY_SEG
#define MEMMAP_EXTRA_MARGIN 7 /* Write this as a suffix for mmap file */
/* this is used to pass to mysql_myisamchk_table */
#define MYISAMCHK_REPAIR 1 /* equivalent to myisamchk -r */
#define MYISAMCHK_VERIFY 2 /* Verify, run repair if failure */
typedef uint mi_bit_type;
typedef struct st_sort_key_blocks SORT_KEY_BLOCKS;
typedef struct st_sort_ftbuf SORT_FT_BUF;
typedef struct st_mi_bit_buff
{ /* Used for packing of record */
mi_bit_type current_byte;
uint bits;
uchar *pos, *end, *blob_pos, *blob_end;
uint error;
} MI_BIT_BUFF;
typedef struct st_sort_info
{
/* sync things */
mysql_mutex_t mutex;
mysql_cond_t cond;
MI_INFO *info;
HA_CHECK *param;
uchar *buff;
SORT_KEY_BLOCKS *key_block, *key_block_end;
SORT_FT_BUF *ft_buf;
my_off_t filelength, dupp, buff_length;
ha_rows max_records;
uint current_key, total_keys;
volatile uint got_error;
uint threads_running;
myf myf_rw;
enum data_file_type new_data_file_type;
} MI_SORT_INFO;
typedef struct st_mi_sort_param
{
pthread_t thr;
IO_CACHE read_cache, tempfile, tempfile_for_exceptions;
DYNAMIC_ARRAY buffpek;
MI_BIT_BUFF bit_buff; /* For parallel repair of packrec. */
MI_KEYDEF *keyinfo;
MI_SORT_INFO *sort_info;
HA_KEYSEG *seg;
uchar **sort_keys;
uchar *rec_buff;
void *wordlist, *wordptr;
MEM_ROOT wordroot;
uchar *record;
MY_TMPDIR *tmpdir;
/*
The next two are used to collect statistics, see update_key_parts for
description.
*/
ulonglong unique[HA_MAX_KEY_SEG+1];
ulonglong notnull[HA_MAX_KEY_SEG+1];
my_off_t pos,max_pos,filepos,start_recpos;
uint key, key_length,real_key_length;
uint maxbuffers, find_length;
ulonglong sortbuff_size;
ha_rows keys;
my_bool fix_datafile, master;
my_bool calc_checksum; /* calculate table checksum */
int (*key_cmp)(struct st_mi_sort_param *, const void *, const void *);
int (*key_read)(struct st_mi_sort_param *,void *);
int (*key_write)(struct st_mi_sort_param *, const void *);
void (*lock_in_memory)(HA_CHECK *);
int (*write_keys)(struct st_mi_sort_param *, uchar **,
ulonglong , struct st_buffpek *, IO_CACHE *);
my_off_t (*read_to_buffer)(IO_CACHE *,struct st_buffpek *, uint);
int (*write_key)(struct st_mi_sort_param *, IO_CACHE *,uchar *,
uint, ulonglong);
} MI_SORT_PARAM;
/* functions in mi_check */
void myisamchk_init(HA_CHECK *param);
int chk_status(HA_CHECK *param, MI_INFO *info);
int chk_del(HA_CHECK *param, MI_INFO *info, ulonglong test_flag);
int chk_size(HA_CHECK *param, MI_INFO *info);
int chk_key(HA_CHECK *param, MI_INFO *info);
int chk_data_link(HA_CHECK *param, MI_INFO *info, my_bool extend);
int mi_repair(HA_CHECK *param, MI_INFO *info, char * name, int rep_quick);
int mi_sort_index(HA_CHECK *param, MI_INFO *info, char * name);
int mi_repair_by_sort(HA_CHECK *param, MI_INFO *info,
const char * name, int rep_quick);
int mi_repair_parallel(HA_CHECK *param, MI_INFO *info,
const char * name, int rep_quick);
int change_to_newfile(const char * filename, const char * old_ext,
const char * new_ext, time_t backup_time, myf myflags);
int lock_file(HA_CHECK *param, File file, my_off_t start, int lock_type,
const char *filetype, const char *filename);
void lock_memory(HA_CHECK *param);
void update_auto_increment_key(HA_CHECK *param, MI_INFO *info,
my_bool repair);
int update_state_info(HA_CHECK *param, MI_INFO *info,uint update);
void update_key_parts(MI_KEYDEF *keyinfo, ulong *rec_per_key_part,
ulonglong *unique, ulonglong *notnull,
ulonglong records);
int filecopy(HA_CHECK *param, File to,File from,my_off_t start,
my_off_t length, const char *type);
int movepoint(MI_INFO *info,uchar *record,my_off_t oldpos,
my_off_t newpos, uint prot_key);
int write_data_suffix(MI_SORT_INFO *sort_info, my_bool fix_datafile);
int test_if_almost_full(MI_INFO *info);
int recreate_table(HA_CHECK *param, MI_INFO **org_info, char *filename);
void mi_disable_non_unique_index(MI_INFO *info, ha_rows rows);
my_bool mi_test_if_sort_rep(MI_INFO *info, ha_rows rows, ulonglong key_map,
my_bool force);
int mi_init_bulk_insert(MI_INFO *info, size_t cache_size, ha_rows rows);
void mi_flush_bulk_insert(MI_INFO *info, uint inx);
int mi_end_bulk_insert(MI_INFO *info, my_bool abort);
int mi_assign_to_key_cache(MI_INFO *info, ulonglong key_map,
KEY_CACHE *key_cache);
void mi_change_key_cache(KEY_CACHE *old_key_cache,
KEY_CACHE *new_key_cache);
int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves);
int write_data_suffix(MI_SORT_INFO *sort_info, my_bool fix_datafile);
int flush_pending_blocks(MI_SORT_PARAM *param);
int sort_ft_buf_flush(MI_SORT_PARAM *sort_param);
int thr_write_keys(MI_SORT_PARAM *sort_param);
int sort_write_record(MI_SORT_PARAM *sort_param);
int _create_index_by_sort(MI_SORT_PARAM *info,my_bool no_messages, ulonglong);
my_bool mi_too_big_key_for_sort(MI_KEYDEF *key, ha_rows rows);
struct OPTIMIZER_COSTS;
void myisam_update_optimizer_costs(struct OPTIMIZER_COSTS *costs);
#ifdef __cplusplus
}
#endif
#endif
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