Handling of large signed/unsigned values was not consistent, so some string functions could return bogus results.
The current fix is to simply patch up the val_str() methods for those string items.
It would be good clean this code up in general, to make similar problems much harder to make. This is left as an exercise for the reader.
spatial index
While executing OPTIMIZE TABLE on MyISAM tables the server re-creates the
index file(s) in order to sort them physically by the key. This cannot be
done for R-tree indexes as it makes no sense.
The server was not checking the type of the index and was accessing an
R-tree index as if it was a B-tree.
Fixed by preventing sorting the index file if it contains an R-tree index.
If SELECT-part of CREATE VIEW statement contains '\Z',
it is not handled correctly.
The problem was in String::print().
Symbol with code 032 (26) is replaced with '\z',
which is not supported by the lexer.
The fix is to replace the symbol with '\Z'.
the UDF
When deleting a user defined function MySQL must remove it from both the
in-memory hash table and the mysql.proc system table.
Finding (and removal therefore) from the internal hash table is case
insensitive (or whatever the default charset is), whereas finding and
removal from the system table is case sensitive.
As a result if you supply a function name that is not in the same character
case to DROP FUNCTION the server will remove the function only from the
in-memory hash table and will keep the row in mysql.proc system table.
This will cause inconsistency between the two structures (that is fixed
only by restarting the server).
Fixed by using the name in the precise case (from the in-memory hash table)
to delete the row in the mysql.proc system table.
Problem:
When creating a temporary field for a temporary table in create_tmp_field_from_field(), a resulting field is created as an exact copy of an original one (in Field::new_field()). However, Field_enum and Field_set contain a pointer (typelib) to memory allocated in the parent table's MEM_ROOT, which under some circumstances may be deallocated later by the time a temporary table is used.
Solution:
Override the new_field() method for Field_enum and Field_set and create a separate copy of the typelib structure in there.
- When this bug was corrected it changed the behavior
for data/index directory in the myisam test case.
- This patch moves the OS depending tests to a non-windows
test file.
Blocked evaluation of constant objects of the classes
Item_func_is_null and Item_is_not_null_test at the
prepare phase in the cases when the objects used subqueries.
Removed an assertion that was not valid for the cases where the query
in a prepared statement contained a single-row non-correlated
subquery that was used as an argument of the IS NULL predicate.
Bug#4968 "Stored procedure crash if cursor opened on altered table"
Bug#19733 "Repeated alter, or repeated create/drop, fails"
Bug#19182 "CREATE TABLE bar (m INT) SELECT n FROM foo; doesn't work from
stored procedure."
Bug#6895 "Prepared Statements: ALTER TABLE DROP COLUMN does nothing"
Bug#22060 "ALTER TABLE x AUTO_INCREMENT=y in SP crashes server"
Test cases for bugs 4968, 19733, 6895 will be added in 5.0.
Re-execution of CREATE DATABASE, CREATE TABLE and ALTER TABLE
statements in stored routines or as prepared statements caused
incorrect results (and crashes in versions prior to 5.0.25).
In 5.1 the problem occured only for CREATE DATABASE, CREATE TABLE
SELECT and CREATE TABLE with INDEX/DATA DIRECTOY options).
The problem of bugs 4968, 19733, 19282 and 6895 was that functions
mysql_prepare_table, mysql_create_table and mysql_alter_table were not
re-execution friendly: during their operation they used to modify contents
of LEX (members create_info, alter_info, key_list, create_list),
thus making the LEX unusable for the next execution.
In particular, these functions removed processed columns and keys from
create_list, key_list and drop_list. Search the code in sql_table.cc
for drop_it.remove() and similar patterns to find evidence.
The fix is to supply to these functions a usable copy of each of the
above structures at every re-execution of an SQL statement.
To simplify memory management, LEX::key_list and LEX::create_list
were added to LEX::alter_info, a fresh copy of which is created for
every execution.
The problem of crashing bug 22060 stemmed from the fact that the above
metnioned functions were not only modifying HA_CREATE_INFO structure in
LEX, but also were changing it to point to areas in volatile memory of
the execution memory root.
The patch solves this problem by creating and using an on-stack
copy of HA_CREATE_INFO (note that code in 5.1 already creates and
uses a copy of this structure in mysql_create_table()/alter_table(),
but this approach didn't work well for CREATE TABLE SELECT statement).
- Using DATA/INDEX DIRECTORY option on Windows put data/index file into
default directory because the OS doesn't support readlink().
- The procedure for changing data/index file directory is
different under Windows.
- With this fix we report a warning if DATA/INDEX option is used,
but OS doesn't support readlink().
table
ROW_FORMAT option is lost during CREATE/DROP INDEX.
This fix forces CREATE/DROP INDEX to retain ROW_FORMAT by instructing
mysql_alter_table() that ROW_FORMAT is not used during creating/dropping
indexes.
The problem is that the GEOMETRY NOT NULL can't automatically set
any value as a default one. We always tried to complete LOAD DATA
command even if there's not enough data in file. That doesn't work
for GEOMETRY NOT NULL. Now Field_*::reset() returns an error sign
and it's checked in mysql_load()
Problem: replication of LC_TIME_NAMES didn't work.
Thus, INSERTS or UPDATES using date_format() always
worked with en_US on the slave side.
Fix: adding ONE_SHOT implementation for LC_TIME_NAMES.
Problem: ``SET PASSWORD FOR foo@localhost'' was written into
binary log using double quites: ``SET PASSWORD FOR "foo"@"localhost"...''.
If sql_mode was set to ANSI_QUOTES, parser on slave considered
"foo" and "localhost" as identifiers instead of strigns constants,
so it failed to parse, generated syntax error and slave then stopped.
Fix: changing binary log entries to use single quotes:
``SET PASSWORD FOR 'foo'@'localhost'...'' not to depend on ANSI_QUOTES.
prepared statement and subquery.
When a field of a view from an outer select is resolved the find_field_in_view
function creates an Item_direct_view_ref object that references the
corresponding view underlying field. After that the view_ref is marked
as a dependent one. While resolving view underlying field it also get
marked as a dependent one due to current_select still points to the subselect.
Marking the view underlying field is wrong and lead to attaching conditions
to a wrong table and thus to the wrong result of the whole statement.
Now mark_select_range_as_dependent() function isn't called for fields from a
view underlying table.
- The table_priv column of table_privs table was altered to a enum type
with fewer enums causing the SHOW/CREATE VIEW grants to be truncated.
- Improved comments and moved all declarations for table_privs, column_privs
and proc_privs to one section for each table making it easy to see hat alterations
are performed on each table
- Reduced the number of ALTER's slightly, but as this is an upgrade script we need
to take all possibilites into account.
This error is displayed anytime the SELECT statement needs a temp table to
return correct results because the object (select_dumpvar) that represents
variables named in the INTO clause stored the results before the temp
table was considered. The problem was fixed by creating the necessary
Item_func_set_user_var objects once the correct data is ready.
ALTER TABLE DISABLE KEYS doesn't work when modifying the table
ENABLE|DISABLE KEYS combined with another ALTER TABLE option, different
than RENAME TO did nothing. Also, if the table had disabled keys
and was ALTER-ed then the end table was with enabled keys.
Fixed by checking whether the table had disabled keys and enabling them
in the copied table.
statements
Currently the optimizer evaluates loose index scan only for top-level SELECT
statements
Extend loose index scan applicability by :
- Test the applicability of loose scan for each sub-select, instead of the
whole query. This change enables loose index scan for sub-queries.
- allow non-select statements with SELECT parts (like, e.g.
CREATE TABLE .. SELECT ...) to use loose index scan.
