logging_ok:

  Logging to logging@openlogging.org accepted
func_group.result, func_group.test:
  Added a test case for bug #8893.
opt_sum.cc:
  A misplaced initialization for the returned parameter
  prefix_len in the function find_key_for_maxmin caused
  usage of a wrong key prefix by the min/max optimization
  in cases when the matching index was not the first index
  that contained the min/max field.


sql/opt_sum.cc:
  A misplaced initialization for the returned parameter
  prefix_len in the function find_key_for_maxmin caused
  usage of a wrong key prefix by the min/max optimization
  in cases when the matching index was not the first index
  that contained the min/max field.
mysql-test/t/func_group.test:
  Added a test case for bug #8893.
mysql-test/r/func_group.result:
  Added a test case for bug #8893.
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

1 files changed, 30 insertions, 0 deletions

diff --git a/mysql-test/t/func_group.test b/mysql-test/t/func_group.test
index 1ee812e5c2f..78e7d3c5ed6 100644
--- a/mysql-test/t/func_group.test
+++ b/mysql-test/t/func_group.test
@@ -496,3 +496,33 @@ drop table t2;
 create table t2 select f2 from (select now() f2 from t1) a;
 show columns from t2;
 drop table t2, t1;
+
+#
+# Bug 8893: wrong result for min/max optimization with 2 indexes
+#
+
+CREATE TABLE t1(
+  id int PRIMARY KEY,
+  a  int,
+  b  int,
+  INDEX i_b_id(a,b,id),
+  INDEX i_id(a,id)
+);
+INSERT INTO t1 VALUES 
+  (1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1);
+SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6;
+DROP TABLE t1;
+
+# change the order of the last two index definitions
+
+CREATE TABLE t1(
+  id int PRIMARY KEY,
+  a  int,
+  b  int,
+  INDEX i_id(a,id),
+  INDEX i_b_id(a,b,id)
+);
+INSERT INTO t1 VALUES 
+  (1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1);
+SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6;
+DROP TABLE t1;