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Bug#48295: explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode

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If an outer query is broken, a subquery might not even get set up.
EXPLAIN EXTENDED did not expect this and merrily tried to de-ref all
of the half-setup info.

We now catch this case and print as much as we have, as it doesn't cost us
anything (doesn't make regular execution slower).
This commit is contained in:
Tatiana A. Nurnberg 2009-10-29 16:01:54 -07:00
parent 842039a1fb
commit d7e7765b36
3 changed files with 44 additions and 3 deletions
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16
mysql-test/r/explain.result
View File

@ -194,4 +194,20 @@ dt
2001-01-01 01:01:01
2001-01-01 01:01:01
drop tables t1, t2;
#
# Bug#48295:
# explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
#
CREATE TABLE t1 (f1 INT);
SELECT @@session.sql_mode INTO @old_sql_mode;
SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
EXPLAIN EXTENDED SELECT 1 FROM t1
WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SHOW WARNINGS;
Level Code Message
Error 1140 Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
Note 1003 select 1 AS `1` from `test`.`t1` where <not>(<exists>(...))
SET SESSION sql_mode=@old_sql_mode;
DROP TABLE t1;
End of 5.1 tests.

20
mysql-test/t/explain.test
View File

@ -167,4 +167,24 @@ flush tables;
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
drop tables t1, t2;
--echo #
--echo # Bug#48295:
--echo # explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
--echo #
CREATE TABLE t1 (f1 INT);
SELECT @@session.sql_mode INTO @old_sql_mode;
SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
# EXPLAIN EXTENDED (with subselect). used to crash. should give NOTICE.
--error ER_MIX_OF_GROUP_FUNC_AND_FIELDS
EXPLAIN EXTENDED SELECT 1 FROM t1
WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
SHOW WARNINGS;
SET SESSION sql_mode=@old_sql_mode;
DROP TABLE t1;
--echo End of 5.1 tests.

11
sql/item_subselect.cc
View File

@ -311,9 +311,14 @@ void Item_subselect::update_used_tables()
void Item_subselect::print(String *str, enum_query_type query_type)
{
str->append('(');
engine->print(str, query_type);
str->append(')');
if (engine)
{
str->append('(');
engine->print(str, query_type);
str->append(')');
}
else
str->append("(...)");
}