xiangfu0 commented on code in PR #11484:
URL: https://github.com/apache/pinot/pull/11484#discussion_r1313654752


##########
pinot-query-planner/src/main/java/org/apache/pinot/query/validate/Validator.java:
##########
@@ -124,4 +129,19 @@ private static String getColumnName(SqlIdentifier 
identifier) {
     List<String> names = identifier.names;
     return names.get(names.size() - 1);
   }
+
+  protected void addToSelectList(
+      List<SqlNode> list,
+      Set<String> aliases,
+      List<Map.Entry<String, RelDataType>> fieldList,
+      SqlNode exp,
+      SelectScope scope,
+      final boolean includeSystemVars) {
+    if (exp.getKind() == SqlKind.IDENTIFIER) {
+      if ((((SqlIdentifier) exp).names).stream().anyMatch(s -> 
s.startsWith("$"))) {

Review Comment:
   I think so, let's add a test for this.



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