Jackie-Jiang commented on a change in pull request #7935:
URL: https://github.com/apache/pinot/pull/7935#discussion_r772765879



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/groupby/DictionaryBasedGroupKeyGenerator.java
##########
@@ -270,6 +270,9 @@ private void processSingleValue(int numDocs, int[] dictIds, 
int[] outGroupIds) {
         if (!_flags[outGroupIds[i]]) {
           _numKeys++;
           _flags[outGroupIds[i]] = true;
+          if (_numKeys == _globalGroupIdUpperBound) {

Review comment:
       We should also add one check before the for loop.
   
   Out of the scope of this PR, in `processSingleValueGeneric()` and 
`processMultiValue()`, should we move `_flags[groupId] = true` into the if 
block?




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