test: add a test case for issue 52933

Signed-off-by: hi-rustin <[email protected]>

Author: 0xPoe

pkg/executor/window_test.go

@@ -470,3 +470,11 @@ func TestIssue45964And46050(t *testing.T) {
 	testReturnColumnNullableAttribute(tk, "cume_dist()", false)
 	testReturnColumnNullableAttribute(tk, "percent_rank()", false)
 }
+
+func TestVarSampAsAWindowFunction(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec("create table t1 (c1 int)")
+	tk.MustExecToErr("select c1, var_samp(c1) over (partition by c1) from t1")
+}