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MDEV-14835 Server crashes in Field_iterator_table::create_item when number of

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elements of BIGINT or YEAR type in the IN list reaches in_predicate_conversion_threshold

The bug appears at the prepare stage when IN-predicate with the long list
of values is converted into IN-subquery. It happens because values in the
right operand of the IN-predicate that have BIGINT or YEAR types are converted
into the Item_int_with_ref.
To fix it in the procedure Item_func_in::create_value_list_for_tvc
real_item() is taken for each value in the right operand of the IN-predicate.
This commit is contained in:
Galina Shalygina 2018-02-14 00:19:38 +02:00
parent 947efe17ed
commit 9d97e6010e
3 changed files with 39 additions and 1 deletions
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18
mysql-test/r/opt_tvc.result
View File

@ -638,3 +638,21 @@ Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` semi join ((values (NULL),(NULL),(NULL),(NULL),(NULL)) `tvc_0`) where `test`.`t1`.`i` = `tvc_0`.`NULL`
SET in_predicate_conversion_threshold= default;
DROP TABLE t1;
#
# MDEV-14835: conversion of TVC with BIGINT or YEAR values
#
SET @@in_predicate_conversion_threshold= 2;
CREATE TABLE t1 (a BIGINT);
CREATE TABLE t2 (y YEAR);
INSERT INTO t1 VALUES (1), (2), (3);
INSERT INTO t2 VALUES (2009), (2010), (2011);
SELECT * FROM t1 WHERE a IN ('1','5','3');
a
1
3
SELECT * FROM t2 WHERE y IN ('2009','2011');
y
2009
2011
DROP TABLE t1,t2;
SET @@in_predicate_conversion_threshold= default;

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

@ -340,3 +340,23 @@ eval EXPLAIN EXTENDED $q;
SET in_predicate_conversion_threshold= default;
DROP TABLE t1;
--echo #
--echo # MDEV-14835: conversion of TVC with BIGINT or YEAR values
--echo #
SET @@in_predicate_conversion_threshold= 2;
CREATE TABLE t1 (a BIGINT);
CREATE TABLE t2 (y YEAR);
INSERT INTO t1 VALUES (1), (2), (3);
INSERT INTO t2 VALUES (2009), (2010), (2011);
SELECT * FROM t1 WHERE a IN ('1','5','3');
SELECT * FROM t2 WHERE y IN ('2009','2011');
DROP TABLE t1,t2;
SET @@in_predicate_conversion_threshold= default;

2
sql/sql_tvc.cc
View File

@ -479,7 +479,7 @@ bool Item_func_in::create_value_list_for_tvc(THD *thd,
return true;
}
}
else if (tvc_value->push_back(args[i]))
else if (tvc_value->push_back(args[i]->real_item()))
return true;
if (values->push_back(tvc_value, thd->mem_root))