=== modified file 'mysql-test/r/group_min_max.result'
--- mysql-test/r/group_min_max.result	2009-02-27 13:25:06 +0000
+++ mysql-test/r/group_min_max.result	2009-06-11 14:24:32 +0000
@@ -2443,4 +2443,19 @@ c
 1
 2
 DROP TABLE t1;
+#
+# Bug #45386: Wrong query result with MIN function in field list, 
+#  WHERE and GROUP BY clause
+#
+CREATE TABLE t (a INT, b INT, INDEX (a,b));
+INSERT INTO t VALUES (2,0), (2,0), (2,1), (2,1);
+INSERT INTO t SELECT * FROM t;
+EXPLAIN
+SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t	range	NULL	a	10	NULL	9	Using where; Using index for group-by
+SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a;
+a	MIN(b)
+2	1
+DROP TABLE t;
 End of 5.0 tests

=== modified file 'mysql-test/t/group_min_max.test'
--- mysql-test/t/group_min_max.test	2009-02-27 13:25:06 +0000
+++ mysql-test/t/group_min_max.test	2009-06-11 14:24:32 +0000
@@ -957,4 +957,22 @@ SELECT DISTINCT c FROM t1 WHERE d=4;
 
 DROP TABLE t1;
 
+--echo #
+--echo # Bug #45386: Wrong query result with MIN function in field list, 
+--echo #  WHERE and GROUP BY clause
+--echo #
+
+CREATE TABLE t (a INT, b INT, INDEX (a,b));
+INSERT INTO t VALUES (2,0), (2,0), (2,1), (2,1);
+INSERT INTO t SELECT * FROM t;
+
+#should use range with index for group by
+EXPLAIN
+SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a;
+#should return 1 row
+SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a;
+
+DROP TABLE t;
+
+
 --echo End of 5.0 tests

=== modified file 'sql/opt_range.cc'
--- sql/opt_range.cc	2009-06-09 16:11:21 +0000
+++ sql/opt_range.cc	2009-06-11 14:24:32 +0000
@@ -9395,8 +9395,8 @@ int QUICK_GROUP_MIN_MAX_SELECT::next_min
       /* Compare the found key with max_key. */
       int cmp_res= key_cmp(index_info->key_part, max_key,
                            real_prefix_len + min_max_arg_len);
-      if (!(((cur_range->flag & NEAR_MAX) && (cmp_res == -1)) ||
-            (cmp_res <= 0)))
+      if (((cur_range->flag & NEAR_MAX) && cmp_res == 0) ||
+          cmp_res > 0)
       {
         result = HA_ERR_KEY_NOT_FOUND;
         continue;