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MDEV-14696 Server crashes in in prep_alter_part_table on 2nd execution of PS.

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The thd->lex->part_info should be kept intact during PS
        execution. Or the second execution gets that modified part_info.
        Let's modify ths->work_part_info instead.
This commit is contained in:
Alexey Botchkov 2018-01-30 11:28:21 +04:00
parent c4a908cb56
commit 6b4a4a85a7
4 changed files with 32 additions and 2 deletions
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11
mysql-test/r/partition.result
View File

@ -2634,3 +2634,14 @@ alter table t1 drop partition if exists p5;
Warnings:
Note 1507 Error in list of partitions to DROP
DROP TABLE t1;
CREATE TABLE t1 (a INT) ENGINE=MyISAM PARTITION BY RANGE(a) (PARTITION p1 VALUES LESS THAN (0));
ALTER TABLE t1 ADD PARTITION (PARTITION p2 VALUES LESS THAN (1));
PREPARE stmt FROM 'ALTER TABLE t1 ADD PARTITION IF NOT EXISTS (PARTITION p2 VALUES LESS THAN (2))';
EXECUTE stmt;
Warnings:
Note 1517 Duplicate partition name p2
EXECUTE stmt;
Warnings:
Note 1517 Duplicate partition name p2
DEALLOCATE PREPARE stmt;
DROP TABLE t1;

13
mysql-test/t/partition.test
View File

@ -2884,3 +2884,16 @@ alter table t1 drop partition if exists p5;
DROP TABLE t1;
#
# MDEV-14696 Server crashes in in prep_alter_part_table on 2nd execution of PS.
#
CREATE TABLE t1 (a INT) ENGINE=MyISAM PARTITION BY RANGE(a) (PARTITION p1 VALUES LESS THAN (0));
ALTER TABLE t1 ADD PARTITION (PARTITION p2 VALUES LESS THAN (1));
PREPARE stmt FROM 'ALTER TABLE t1 ADD PARTITION IF NOT EXISTS (PARTITION p2 VALUES LESS THAN (2))';
EXECUTE stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
DROP TABLE t1;

7
sql/sql_partition.cc
View File

@ -4713,7 +4713,12 @@ uint prep_alter_part_table(THD *thd, TABLE *table, Alter_info *alter_info,
DBUG_RETURN(TRUE);
}
thd->work_part_info= thd->lex->part_info;
/*
One of these is done in handle_if_exists_option():
thd->work_part_info= thd->lex->part_info;
or
thd->work_part_info= NULL;
*/
if (thd->work_part_info &&
!(thd->work_part_info= thd->work_part_info->get_clone()))

3
sql/sql_table.cc
View File

@ -5997,6 +5997,7 @@ remove_key_no_warn:
#ifdef WITH_PARTITION_STORAGE_ENGINE
partition_info *tab_part_info= table->part_info;
thd->work_part_info= thd->lex->part_info;
if (tab_part_info && thd->lex->check_exists)
{
/* ALTER TABLE ADD PARTITION IF NOT EXISTS */
@ -6015,7 +6016,7 @@ remove_key_no_warn:
ER_SAME_NAME_PARTITION, ER(ER_SAME_NAME_PARTITION),
pe->partition_name);
alter_info->flags&= ~Alter_info::ALTER_ADD_PARTITION;
thd->lex->part_info= NULL;
thd->work_part_info= NULL;
break;
}
}