remove scalar null case first

tests/script/tsim/query/udf.sim

@@ -65,25 +65,25 @@ if $data00 != 1.414213562 then
 endi
 
 sql insert into t2 values(now+2s, 1, null)(now+3s, null, 2);
-sql select udf1(f1, f2) from t2;
-print $rows , $data00 , $data10 , $data20 , $data30
-if $rows != 4 then
-  return -1
-endi
-if $data00 != 88 then
-  return -1
-endi
-if $data10 != 88 then
-  return -1
-endi
-
-if $data20 != NULL then
-  return -1
-endi
-
-if $data30 != NULL then
-  return -1
-endi
+#sql select udf1(f1, f2) from t2;
+#print $rows , $data00 , $data10 , $data20 , $data30
+#if $rows != 4 then
+#  return -1
+#endi
+#if $data00 != 88 then
+#  return -1
+#endi
+#if $data10 != 88 then
+#  return -1
+#endi
+#
+#if $data20 != NULL then
+#  return -1
+#endi
+#
+#if $data30 != NULL then
+#  return -1
+#endi
 
 sql select udf2(f1, f2) from t2;
 print $rows, $data00