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MDEV-7792 - SQL Parsing Error - UNION AND ORDER BY WITH JOIN

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ORDER BY against union may confuse name resolution context, causing valid
SQL statements to fail.

The purpose of context change was presumably intended for the duration of
gathering field list for ORDER BY. However it isn't actually required (name
resolution context is never accessed by the latter).

See also alternative solution (in MySQL 5.7): 92145b95.
This commit is contained in:
Sergey Vojtovich
2015-06-24 14:58:17 +04:00
parent ad9b3263d3
commit 0865e3deab
3 changed files with 14 additions and 1 deletions
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7
mysql-test/r/parser.result
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@ -643,3 +643,10 @@ CREATE TRIGGER trigger1 BEFORE INSERT ON t1 FOR EACH ROW
SET default_storage_engine = NEW.INNODB;
ERROR 42S22: Unknown column 'INNODB' in 'NEW'
DROP TABLE t1;
#
# MDEV-7792 - SQL Parsing Error - UNION AND ORDER BY WITH JOIN
#
CREATE TABLE t1(a INT);
SELECT * FROM t1 JOIN ((SELECT 1 AS b) UNION ALL (SELECT 2 AS b) ORDER BY b DESC) s1 WHERE a=1;
a b
DROP TABLE t1;