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Diffstat (limited to 'mysql-test/t/subselect.test')
| -rw-r--r-- | mysql-test/t/subselect.test | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/mysql-test/t/subselect.test b/mysql-test/t/subselect.test index 16556c4864c..9cf9f13cfea 100644 --- a/mysql-test/t/subselect.test +++ b/mysql-test/t/subselect.test @@ -1287,3 +1287,22 @@ INSERT INTO `t2` VALUES (6,5,12,7,'a'),(12,0,0,7,'a'),(12,1,0,7,'a'),(12,5,5,7,' SELECT b.sc FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b; SELECT b.ac FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b; drop tables t1,t2; + +# +# Test for bug #6462. "Same request on same data returns different +# results." a.k.a. "Proper cleanup of subqueries is missing for +# SET and DO statements". +# +create table t1 (a int not null, b int not null, c int, primary key (a,b)); +insert into t1 values (1,1,1), (2,2,2), (3,3,3); +set @b:= 0; +# Let us check that subquery will use covering index +explain select sum(a) from t1 where b > @b; +# This should not crash -debug server due to failing assertion +set @a:= (select sum(a) from t1 where b > @b); +# And this should not falsely report index usage +explain select a from t1 where c=2; +# Same for DO statement +do @a:= (select sum(a) from t1 where b > @b); +explain select a from t1 where c=2; +drop table t1; |