1 files changed, 37 insertions, 0 deletions
diff --git a/mysql-test/t/subselect4.test b/mysql-test/t/subselect4.test
index 50b34eece89..14b62bfd2f7 100644
--- a/mysql-test/t/subselect4.test
+++ b/mysql-test/t/subselect4.test
@@ -1777,5 +1777,42 @@ drop table t1, t2;
 
 set optimizer_switch=@subselect4_tmp;
 
+--echo #
+--echo # MDEV-3899  Valgrind warnings (blocks are definitely lost) in filesort on IN subquery with SUM and DISTINCT
+--echo #
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(9);
+
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (8);
+
+SELECT * FROM t1 
+WHERE (1, 1) IN (SELECT a, SUM(DISTINCT a) FROM t1, t2 GROUP BY a);
+
+drop table t1, t2;
+
+--echo #
+--echo # MDEV-3902  Assertion `record_length == m_record_length' failed at Filesort_buffer::alloc_sort_buffer 
+--echo #
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2);
+
+CREATE TABLE t2 (pk INT PRIMARY KEY, b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1,1),(2,7);
+
+CREATE TABLE t3 (c INT) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (8);
+
+SELECT * FROM t1
+WHERE (1, 5)  IN (SELECT b, SUM(DISTINCT b) FROM t2, t3 GROUP BY b);
+
+SELECT * FROM t2 AS alias1, t2 AS alias2
+WHERE EXISTS ( SELECT 1 ) AND (alias2.pk = alias1.b )
+ORDER BY alias1.b;
+
+drop table t1, t2, t3;
+
 SET optimizer_switch= @@global.optimizer_switch;
 set @@tmp_table_size= @@global.tmp_table_size;