Jackie-Jiang commented on code in PR #14233:
URL: https://github.com/apache/pinot/pull/14233#discussion_r1805616633


##########
pinot-query-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotWindowExchangeNodeInsertRule.java:
##########
@@ -209,23 +244,37 @@ private void validateWindows(Window window) {
   }
 
   private void validateWindowAggCallsSupported(Window.Group windowGroup) {
-    for (int i = 0; i < windowGroup.aggCalls.size(); i++) {
-      Window.RexWinAggCall aggCall = windowGroup.aggCalls.get(i);
+    for (Window.RexWinAggCall aggCall : windowGroup.aggCalls) {
       SqlKind aggKind = aggCall.getKind();
       
Preconditions.checkState(SUPPORTED_WINDOW_FUNCTION_KIND.contains(aggKind),
           String.format("Unsupported Window function kind: %s. Only 
aggregation functions are supported!", aggKind));
     }
   }
 
   private void validateWindowFrames(Window.Group windowGroup) {
-    // Has ROWS only aggregation call kind (e.g. ROW_NUMBER)?
-    boolean isRowsOnlyTypeAggregateCall = 
isRowsOnlyAggregationCallType(windowGroup.aggCalls);
+    // Has rank based aggregation call kind (e.g. ROW_NUMBER, RANK, DENSE_RANK)
+    boolean hasRankBasedAgg = hasRankBasedAgg(windowGroup.aggCalls);
+
+    // FOLLOWING lower bound or PRECEDING upper bound is not allowed, and 
won't reach here

Review Comment:
   Interesting! Does it mean it can do something like `BETWEEN 5 PRECEDING AND 
3 PRECEDING`?



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