executor: clean outerMatchedStatus when HashJoin.C ... (#19510)

executor/join.go

@@ -135,6 +135,7 @@ func (e *HashJoinExec) Close() error {
 		e.joinChkResourceCh = nil
 		terror.Call(e.rowContainer.Close)
 	}
+	e.outerMatchedStatus = e.outerMatchedStatus[:0]
 
 	if e.runtimeStats != nil {
 		concurrency := cap(e.joiners)

executor/join_test.go

@@ -2254,3 +2254,18 @@ func (s *testSuiteJoin3) TestIssue19498(c *C) {
 	rs = tk.MustQuery("select c_str, (select /*+ INL_MERGE_JOIN(t1,t3) */ max(t1.c_int) from t1, t3 where t1.c_int = t3.c_int and t2.c_str > t3.c_str) q from t2 order by c_str;")
 	rs.Check(testkit.Rows("happy archimedes 2", "happy fermat 2", "happy hypatia 2", "zen sammet 4"))
 }
+
+func (s *testSuiteJoin3) TestIssue19500(c *C) {
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec("drop table if exists t1;")
+	tk.MustExec("create table t1 (c_int int, primary key (c_int));")
+	tk.MustExec("insert into t1 values (1),(2),(3),(4),(5);")
+	tk.MustExec("drop table if exists t2;")
+	tk.MustExec("create table t2 (c_int int unsigned, c_str varchar(40), primary key (c_int), key (c_str));")
+	tk.MustExec("insert into t2 values (1, 'dazzling panini'),(2, 'infallible perlman'),(3, 'recursing cannon'),(4, 'vigorous satoshi'),(5, 'vigilant gauss'),(6, 'nervous jackson');\n")
+	tk.MustExec("drop table if exists t3;")
+	tk.MustExec("create table t3 (c_int int, c_str varchar(40), key (c_str));")
+	tk.MustExec("insert into t3 values (1, 'sweet morse'),(2, 'reverent golick'),(3, 'clever rubin'),(4, 'flamboyant morse');")
+	tk.MustQuery("select (select (select sum(c_int) from t3 where t3.c_str > t2.c_str) from t2 where t2.c_int > t1.c_int order by c_int limit 1) q from t1 order by q;").
+		Check(testkit.Rows("<nil>", "<nil>", "3", "3", "3"))
+}