1 files changed, 69 insertions, 0 deletions
diff --git a/mysql-test/t/subselect_sj.test b/mysql-test/t/subselect_sj.test
index c989cb22558..b26d5a71e46 100644
--- a/mysql-test/t/subselect_sj.test
+++ b/mysql-test/t/subselect_sj.test
@@ -2704,5 +2704,74 @@ explain
 select 1 from t1 where _cp932 "1" in (select '1' from t1);
 drop table t1;
 
+--echo #
+--echo # MDEV-7823: Server crashes in next_depth_first_tab on nested IN clauses with SQ inside
+--echo #
+set @tmp_mdev7823=@@optimizer_switch;
+set optimizer_switch=default;
+CREATE TABLE t1 (f1 INT);
+INSERT INTO t1 VALUES (1);
+
+CREATE TABLE t2 (f2 INT, KEY(f2));
+INSERT INTO t2 VALUES (8),(0);
+
+CREATE TABLE t3 (f3 INT);
+INSERT INTO t3 VALUES (1),(2);
+
+CREATE TABLE t4 (f4 INT);
+INSERT INTO t4 VALUES (0),(5);
+
+explain 
+SELECT * FROM t1, t2, t3 WHERE f2 IN ( f1 IN ( SELECT f4 FROM t4 ) );
+SELECT * FROM t1, t2, t3 WHERE f2 IN ( f1 IN ( SELECT f4 FROM t4 ) );
+
+drop table t1,t2,t3,t4;
+set optimizer_switch= @tmp_mdev7823;
+
+--echo #
+--echo # MDEV-6859: scalar subqueries in a comparison produced unexpected result
+--echo #
+set @tmp_mdev6859=@@optimizer_switch;
+set optimizer_switch=default;
+CREATE TABLE t1 (
+  project_number varchar(50) NOT NULL,
+  PRIMARY KEY (project_number)
+) ENGINE=MyISAM;
+
+INSERT INTO t1 (project_number) VALUES ('aaa'),('bbb');
+
+CREATE TABLE t2 (
+  id int(10) unsigned NOT NULL AUTO_INCREMENT,
+  project_number varchar(50) NOT NULL,
+  history_date date NOT NULL,
+  country varchar(50) NOT NULL,
+  PRIMARY KEY (id)
+) ENGINE=MyISAM;
+
+INSERT INTO t2 (id, project_number, history_date, country) VALUES
+(1, 'aaa', '2014-08-09', 'france'),(2, 'aaa', '2014-09-09', 'singapore');
+
+CREATE TABLE t3 (
+  region varchar(50) NOT NULL,
+  country varchar(50) NOT NULL
+) ENGINE=MyISAM;
+
+INSERT INTO t3 (region, country) VALUES ('apac', 'singapore'),('eame', 'france');
+
+SELECT SQL_NO_CACHE a.project_number 
+FROM t1 a 
+WHERE ( SELECT z.country 
+        FROM t2 z 
+        WHERE z.project_number = a.project_number AND z.history_date <= '2014-09-01' 
+        ORDER BY z.id DESC LIMIT 1 
+      ) IN ( 
+         SELECT r.country 
+         FROM t3 r 
+         WHERE r.region = 'eame'
+      );
+
+drop table t1, t2, t3;
+set optimizer_switch= @tmp_mdev6859;
+
 # The following command must be the last one the file 
 set optimizer_switch=@subselect_sj_tmp;