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Bug #53450: Crash / assertion "virtual int

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ha_myisam::index_first(uchar*)") at assert.c:81

Single-table DELETE crash/assertion similar to single-table
UPDATE bug 14272.

Same resolution as for the bug 14272:
Don't run index scan when we should use quick select.
This could cause failures because there are table handlers (like federated)
that support quick select scanning but do not support index scanning.
This commit is contained in:
Gleb Shchepa 2010-05-14 15:36:27 +04:00
parent a882f7e683
commit 09b6efcc76
3 changed files with 22 additions and 1 deletions
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9
mysql-test/r/delete.result
View file

@ -349,4 +349,13 @@ END |
DELETE IGNORE FROM t1;
ERROR HY000: Can't update table 't1' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
DROP TABLE t1;
#
# Bug #53450: Crash/assertion
# "virtual int ha_myisam::index_first(uchar*)") at assert.c:81
#
CREATE TABLE t1 (a INT, b INT, c INT,
INDEX(a), INDEX(b), INDEX(c));
INSERT INTO t1 VALUES (1,2,3), (4,5,6), (7,8,9);
DELETE FROM t1 WHERE a = 10 OR b = 20 ORDER BY c LIMIT 1;
DROP TABLE t1;
End of 5.1 tests

12
mysql-test/t/delete.test
View file

@ -374,5 +374,17 @@ DELETE IGNORE FROM t1;
DROP TABLE t1;
--echo #
--echo # Bug #53450: Crash/assertion
--echo # "virtual int ha_myisam::index_first(uchar*)") at assert.c:81
--echo #
CREATE TABLE t1 (a INT, b INT, c INT,
INDEX(a), INDEX(b), INDEX(c));
INSERT INTO t1 VALUES (1,2,3), (4,5,6), (7,8,9);
DELETE FROM t1 WHERE a = 10 OR b = 20 ORDER BY c LIMIT 1;
DROP TABLE t1;
--echo End of 5.1 tests

2
sql/sql_delete.cc
View file

@ -266,7 +266,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
free_underlaid_joins(thd, select_lex);
DBUG_RETURN(TRUE);
}
if (usable_index==MAX_KEY)
if (usable_index==MAX_KEY || (select && select->quick))
init_read_record(&info, thd, table, select, 1, 1, FALSE);
else
init_read_record_idx(&info, thd, table, 1, usable_index);