xiangfu0 commented on code in PR #16746:
URL: https://github.com/apache/pinot/pull/16746#discussion_r2324063792


##########
pinot-controller/src/main/java/org/apache/pinot/controller/api/resources/PinotQueryResource.java:
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@@ -160,54 +160,67 @@ public StreamingOutput 
handleTimeSeriesQueryRange(@QueryParam("language") String
 
   @POST
   @Path("validateMultiStageQuery")
-  public MultiStageQueryValidationResponse 
validateMultiStageQuery(MultiStageQueryValidationRequest request,
+  public List<MultiStageQueryValidationResponse> 
validateMultiStageQuery(MultiStageQueryValidationRequest request,

Review Comment:
   When is API introduced, shall we keep backward compatible for it?
   If this is introduced before 1.4.0 release, then better keep it and create a 
new method: `validateMultiStageQueries`



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