Akanksha-kedia commented on code in PR #18820:
URL: https://github.com/apache/pinot/pull/18820#discussion_r3472102274


##########
pinot-core/src/main/java/org/apache/pinot/core/query/reduce/GapfillProcessor.java:
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@@ -89,7 +90,12 @@ public void process(BrokerResponseNative 
brokerResponseNative) {
 
     // The first one argument of timeSeries is time column. The left ones are 
defining entity.
     for (ExpressionContext entityColum : _timeSeries) {
-      int index = indexes.get(entityColum.getIdentifier());
+      String colName = entityColum.getIdentifier();
+      Integer index = indexes.get(colName);
+      if (index == null) {
+        throw new BadQueryRequestException(

Review Comment:
   Addressed — the validation now happens in 
`GapfillUtils.stripGapfill(PinotQuery)`, which is called at query compile time 
before any server round-trip. The null-check in `GapfillProcessor` is kept as a 
safety net but the user-facing error is thrown earlier.



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