Jackie-Jiang commented on a change in pull request #5419:
URL: https://github.com/apache/incubator-pinot/pull/5419#discussion_r428187692
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/groupby/DictionaryBasedGroupKeyGenerator.java
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@@ -106,18 +108,26 @@ public DictionaryBasedGroupKeyGenerator(TransformOperator
transformOperator,
_isSingleValueColumn[i] =
transformOperator.getResultMetadata(groupByExpression).isSingleValue();
}
-
if (longOverflow) {
_globalGroupIdUpperBound = numGroupsLimit;
- _rawKeyHolder = new ArrayMapBasedHolder(_globalGroupIdUpperBound);
+ if
(!mapBasedRawKeyHolders.containsKey(ArrayMapBasedHolder.class.getName())) {
Review comment:
Use `computeIfAbsent()` to save one extra map lookup.
Also, because you already know the type of key holders, maybe add a separate
class to store different type of holders without map lookup?
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