amrishlal commented on code in PR #9236:
URL: https://github.com/apache/pinot/pull/9236#discussion_r954116254


##########
pinot-core/src/test/java/org/apache/pinot/queries/BaseQueriesTest.java:
##########
@@ -146,14 +160,21 @@ private BrokerResponseNative getBrokerResponse(String 
query, PlanMaker planMaker
   /**
    * Run query on multiple index segments with custom plan maker.
    * <p>Use this to test the whole flow from server to broker.
-   * <p>The result should be equivalent to querying 4 identical index segments.
+   * <p>Unless explicitly override getDistinctInstances or initialize 2 
distinct index segments in test, the result
+   * should be equivalent to querying 4 identical index segments. Otherwise, 
the result will be equivalent to
+   * querying 2 distinct instances each having 2 segments.
    */
   private BrokerResponseNative getBrokerResponse(PinotQuery pinotQuery, 
PlanMaker planMaker) {
     PinotQuery serverPinotQuery = GapfillUtils.stripGapfill(pinotQuery);
     QueryContext queryContext = 
QueryContextConverterUtils.getQueryContext(pinotQuery);
     QueryContext serverQueryContext =
         serverPinotQuery == pinotQuery ? queryContext : 
QueryContextConverterUtils.getQueryContext(serverPinotQuery);
 
+    List<List<IndexSegment>> instances = getDistinctInstances();
+    if (instances.size() == 2) {
+      return getBrokerResponseDistinctInstances(pinotQuery, planMaker);
+    }
+

Review Comment:
   This appears to be hardcoding how a query will be executed when there are 
two segments. If I understand correctly there are two problems here: 1) the 
result is being duplicated which is causing problem with covariance values, and 
2) ability to run queries against multiple segment.  I ran into the same issue 
while testing a feature that I am working on. The first problem can be solved 
by adding a boolean variable for not duplicating the query results. The second 
(executing queries against multiple segments can be solved by local setup in 
the `CovarianceQueriesTest.java`. I will share the code with you offline. Let's 
see if we can do this without hardcoding for 2 segments.



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