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join_nested.result, join_nested.test:

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Added a teast case for bug #11284.
sql_select.cc:
  Fixed bug #11284.
  Optimization with empty inner table currently cannot be
  used in the case of nested outer join.
This commit is contained in:
igor@rurik.mysql.com
2005-06-15 05:56:19 -07:00
parent aeb5ab5d4c
commit 4bfe1cc843
3 changed files with 41 additions and 1 deletions
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18
mysql-test/t/join_nested.test
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@@ -752,3 +752,21 @@ EXPLAIN SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
SELECT a, b, c FROM t1 LEFT JOIN (t2, t3) ON b < 3 and b = c;
DROP TABLE t1,t2,t3;
#
# Test for bug #11284: empty table in a nested left join
#
CREATE TABLE t1 (c11 int);
CREATE TABLE t2 (c21 int);
CREATE TABLE t3 (c31 int);
INSERT INTO t1 VALUES (4), (5);
SELECT * FROM t1 LEFT JOIN t2 ON c11=c21;
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON c11=c21;
SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
EXPLAIN SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
DROP TABLE t1,t2,t3;