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Fixed bug mdev-11608.

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The fix for bug mdev-11488 introduced the virtual method
convert_to_basic_const_item for the class Item_cache.
The implementation of this method for the class Item_cache_str
was not quite correct: the server could crash if the cached item
was null.
A similar problem could appear for the implementation of
this method for the class Item_cache_decimal. Although I could not
reproduce the problem I decided to change the code appropriately.
This commit is contained in:
Igor Babaev
2016-12-20 11:08:50 -08:00
parent 95228dc80b
commit 9b27d3e86e
3 changed files with 104 additions and 8 deletions
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30
mysql-test/t/derived_cond_pushdown.test
View File

@ -1289,3 +1289,33 @@ SELECT * FROM v1 WHERE NULLIF(1, i);
DROP VIEW v1;
DROP TABLE t1;
--echo #
--echo # MDEV-11608: pushdown of the predicate with cached null value
--echo #
CREATE TABLE t1 (c VARCHAR(3));
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES ('foo'),('bar');
CREATE TABLE t2 (c VARCHAR(3));
INSERT INTO t2 VALUES ('foo'),('xyz');
SELECT * FROM v1 WHERE v1.c IN ( SELECT MIN(c) FROM t2 WHERE 0 );
EXPLAIN FORMAT=JSON
SELECT * FROM v1 WHERE v1.c IN ( SELECT MIN(c) FROM t2 WHERE 0 );
DROP VIEW v1;
DROP TABLE t1,t2;
CREATE TABLE t1 (d DECIMAL(10,2));
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES (5.37),(1.1);
CREATE TABLE t2 (d DECIMAL(10,2));
INSERT INTO t2 VALUES ('1.1'),('2.23');
SELECT * FROM v1 WHERE v1.d IN ( SELECT MIN(d) FROM t2 WHERE 0 );
DROP VIEW v1;
DROP TABLE t1,t2;