1 files changed, 45 insertions, 0 deletions
diff --git a/mysql-test/main/join_optimizer.test b/mysql-test/main/join_optimizer.test
new file mode 100644
index 00000000000..3afe82113b9
--- /dev/null
+++ b/mysql-test/main/join_optimizer.test
@@ -0,0 +1,45 @@
+--disable_warnings
+drop table if exists t0,t1,t2,t3;
+--enable_warnings
+
+--echo #
+--echo # BUG#38049 incorrect rows estimations with references from preceding table
+--echo #
+
+create table t0 (a int);
+insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+
+create table t1 (a varchar(32));
+insert into t1 values ('owner'),('requester'),('admincc'),('cc');
+
+CREATE TABLE t2 (
+  id int(11) NOT NULL,
+  type varchar(32) default NULL,
+  PRIMARY KEY  (id)
+);
+insert into t2 values (1,'owner'), (2,'admincc');
+
+
+CREATE TABLE t3 (
+  id int(11) NOT NULL,
+  domain varchar(32) default NULL,
+  type varchar(32) default NULL,
+  PRIMARY KEY  (id)
+);
+
+set @domain='system';
+set @pk=0;
+INSERT INTO t3 select @pk:=@pk+1, 'system', t1.a from t1;
+INSERT INTO t3 select @pk:=@pk+1, 'queue', t1.a from t1, t0 where t0.a<3;
+INSERT INTO t3 select @pk:=@pk+1, 'ticket', t1.a from t1, t0 A, t0 B, t0 C;
+
+CREATE INDEX groups_d ON t3(domain);
+CREATE INDEX groups_t ON t3(type);
+CREATE INDEX groups_td ON t3(type, domain);
+CREATE INDEX groups_dt ON t3(domain, type);
+--echo For table g this must use ref(groups_dt) and #rows should be around 15 and not 335:
+explain 
+SELECT STRAIGHT_JOIN g.id FROM t2 a, t3 g USE INDEX(groups_dt) 
+WHERE g.domain = 'queue' AND g.type = a.type;
+
+drop table t0,t1,t2,t3;