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Bug#47669 Query showed by EXPLAIN EXTENDED gives different result from original query

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Item_field::print method does not take into
account fields whose values may be null.
The fix is to print 'NULL' if field value is null.
This commit is contained in:
Sergey Glukhov
2010-02-26 17:40:01 +04:00
parent 3fcb25d806
commit 5d9a74f22d
8 changed files with 48 additions and 16 deletions
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12
mysql-test/t/explain.test
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@@ -187,4 +187,16 @@ SET SESSION sql_mode=@old_sql_mode;
DROP TABLE t1;
--echo #
--echo # Bug#47669: Query showed by EXPLAIN EXTENDED gives different result from original query
--echo #
CREATE TABLE t1 (c int);
INSERT INTO t1 VALUES (NULL);
CREATE TABLE t2 (d int);
INSERT INTO t2 VALUES (NULL), (0);
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1;
DROP TABLE t1, t2;
--echo End of 5.1 tests.