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MDEV-18300: ASAN error in Field_blob::get_key_image upon UPDATE with subquery

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For single table updates and multi-table updates , engine independent statistics were not being
read even if the statistics were collected.
Fixed it, so when the optimizer_use_condition_selectivity > 2 then we would read the available
statistics for update queries.
This commit is contained in:
Varun Gupta
2019-04-11 13:05:01 +05:30
parent 812ac2bb85
commit 409dddf695
4 changed files with 57 additions and 0 deletions
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24
mysql-test/r/update_innodb.result
View File

@ -65,3 +65,27 @@ SELECT * FROM t1;
a_id b_id c_id
1 NULL NULL
drop table t1,t2;
#
# MDEV-18300: ASAN error in Field_blob::get_key_image upon UPDATE with subquery
#
set @save_optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
set @save_use_stat_tables= @@use_stat_tables;
set use_stat_tables=preferably;
set optimizer_use_condition_selectivity=4;
CREATE TABLE t1 (a INT, b CHAR(8)) ENGINE=InnoDB;
insert into t1 values (1,'foo'),(2, 'abc');
CREATE TABLE t2 (c CHAR(8), d BLOB) ENGINE=InnoDB;
insert into t2 values ('abc', 'foo'),('edf', 'food');
ANALYZE TABLE t1,t2;
UPDATE t1 SET a = 1 WHERE b = ( SELECT c FROM t2 WHERE d = 'foo' );
SELECT * FROM t1;
a b
1 foo
1 abc
DROP TABLE t1, t2;
create table t1 (a int not null, b int, c int) engine=InnoDB;
create table t2 (d int, e int) engine=InnoDB;
update t1, t2 set a=NULL, b=2, c=NULL where b=d and e=200;
drop table t1,t2;
set @@optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
set @@use_stat_tables= @save_use_stat_tables;

29
mysql-test/t/update_innodb.test
View File

@ -75,3 +75,32 @@ SELECT t2.b_id FROM t1,t2 WHERE t2.c_id = t1.c_id;
UPDATE t1 SET b_id = (SELECT t2.b_id FROM t2 t2 WHERE t2.c_id = t1.c_id);
SELECT * FROM t1;
drop table t1,t2;
--echo #
--echo # MDEV-18300: ASAN error in Field_blob::get_key_image upon UPDATE with subquery
--echo #
set @save_optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
set @save_use_stat_tables= @@use_stat_tables;
set use_stat_tables=preferably;
set optimizer_use_condition_selectivity=4;
CREATE TABLE t1 (a INT, b CHAR(8)) ENGINE=InnoDB;
insert into t1 values (1,'foo'),(2, 'abc');
CREATE TABLE t2 (c CHAR(8), d BLOB) ENGINE=InnoDB;
insert into t2 values ('abc', 'foo'),('edf', 'food');
--disable_result_log
ANALYZE TABLE t1,t2;
--enable_result_log
UPDATE t1 SET a = 1 WHERE b = ( SELECT c FROM t2 WHERE d = 'foo' );
SELECT * FROM t1;
DROP TABLE t1, t2;
create table t1 (a int not null, b int, c int) engine=InnoDB;
create table t2 (d int, e int) engine=InnoDB;
update t1, t2 set a=NULL, b=2, c=NULL where b=d and e=200;
drop table t1,t2;
set @@optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
set @@use_stat_tables= @save_use_stat_tables;

1
sql/sql_statistics.cc
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@ -4071,6 +4071,7 @@ bool is_eits_usable(Field *field)
partition list of a table. We assume the selecticivity for
such columns would be handled during partition pruning.
*/
DBUG_ASSERT(field->table->stats_is_read);
Column_statistics* col_stats= field->read_stats;
return col_stats && !col_stats->no_stat_values_provided() && //(1)
field->type() != MYSQL_TYPE_GEOMETRY && //(2)

3
sql/sql_update.cc
View File

@ -301,6 +301,8 @@ int mysql_update(THD *thd,
if (lock_tables(thd, table_list, table_count, 0))
DBUG_RETURN(1);
(void) read_statistics_for_tables_if_needed(thd, table_list);
if (table_list->handle_derived(thd->lex, DT_MERGE_FOR_INSERT))
DBUG_RETURN(1);
if (table_list->handle_derived(thd->lex, DT_PREPARE))
@ -1540,6 +1542,7 @@ int mysql_multi_update_prepare(THD *thd)
{
DBUG_RETURN(TRUE);
}
(void) read_statistics_for_tables_if_needed(thd, table_list);
/* @todo: downgrade the metadata locks here. */
/*