1 files changed, 107 insertions, 0 deletions
diff --git a/mysql-test/main/group_min_max_innodb.result b/mysql-test/main/group_min_max_innodb.result
index fed3d30b..27656374 100644
--- a/mysql-test/main/group_min_max_innodb.result
+++ b/mysql-test/main/group_min_max_innodb.result
@@ -330,6 +330,113 @@ JOIN t1 ON dt.a=t1.b;
 a
 Australia
 DROP TABLES t1, t2;
+#
+# MDEV-15656: Assertion `is_last_prefix <= 0' failed in
+#             QUICK_GROUP_MIN_MAX_SELECT::get_next
+#
+SET @lru_depth.save= @@innodb_lru_scan_depth;
+SET GLOBAL innodb_lru_scan_depth= 1024;
+CREATE TABLE t1 (
+pk_part1 INT AUTO_INCREMENT,
+a VARCHAR(4),
+row_start timestamp(6) default current_timestamp,
+PRIMARY KEY (pk_part1, row_start)
+) ENGINE=InnoDB;
+INSERT INTO t1 (a) VALUES
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo'),
+('foo'),('bar'),('foo'),('bar'),('foo');
+connect  con1,localhost,root,,test;
+SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+SELECT DISTINCT pk_part1 FROM t1;
+connection default;
+INSERT INTO t1 (pk_part1) VALUES (NULL);
+connection con1;
+disconnect con1;
+connection default;
+DROP TABLE t1;
+SET GLOBAL innodb_lru_scan_depth= @lru_depth.save;
 set global innodb_stats_persistent= @innodb_stats_persistent_save;
 set global innodb_stats_persistent_sample_pages=
 @innodb_stats_persistent_sample_pages_save;