planner: don't push down predicates over table dual (#35669)

close #35527

planner/core/plan_test.go

@@ -892,3 +892,14 @@ func TestIssue34863(t *testing.T) {
 	tk.MustQuery("select count(*) from c right join o on c.c_id=o.c_id;").Check(testkit.Rows("5"))
 	tk.MustQuery("select count(o.c_id) from c right join o on c.c_id=o.c_id;").Check(testkit.Rows("5"))
 }
+
+// https://github.com/pingcap/tidb/issues/35527.
+func TestTableDualAsSubQuery(t *testing.T) {
+	store, clean := testkit.CreateMockStore(t)
+	defer clean()
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec("CREATE VIEW v0(c0) AS SELECT NULL;")
+	tk.MustQuery("SELECT v0.c0 FROM v0 WHERE (v0.c0 IS NULL) LIKE(NULL);").Check(testkit.Rows())
+	tk.MustQuery("SELECT v0.c0 FROM (SELECT null as c0) v0 WHERE (v0.c0 IS NULL) like (NULL);").Check(testkit.Rows())
+}

planner/core/rule_predicate_push_down.go

@@ -417,6 +417,11 @@ func (p *LogicalProjection) PredicatePushDown(predicates []expression.Expression
 			return predicates, child
 		}
 	}
+	if len(p.children) == 1 {
+		if _, isDual := p.children[0].(*LogicalTableDual); isDual {
+			return predicates, p
+		}
+	}
 	for _, cond := range predicates {
 		newFilter := expression.ColumnSubstitute(cond, p.Schema(), p.Exprs)
 		if !expression.HasGetSetVarFunc(newFilter) {