mihaibudiu commented on code in PR #4117:
URL: https://github.com/apache/calcite/pull/4117#discussion_r1898974255


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core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java:
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@@ -1965,6 +1965,13 @@ private boolean needNewSubQuery(
         return true;
       }
 
+      if (rel instanceof Aggregate

Review Comment:
   seems you need an extra check for null here



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