somandal commented on code in PR #10845:
URL: https://github.com/apache/pinot/pull/10845#discussion_r1230366679
##########
pinot-query-planner/src/main/java/org/apache/calcite/rel/hint/PinotHintStrategyTable.java:
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@@ -29,6 +29,9 @@
public class PinotHintStrategyTable {
public static final String INTERNAL_AGG_INTERMEDIATE_STAGE =
"aggIntermediateStage";
public static final String INTERNAL_AGG_FINAL_STAGE = "aggFinalStage";
+ // Hint to denote that aggregation is to be run as a single stage rather
than split into an intermediate and a final
+ // stage
+ public static final String INTERNAL_IS_SINGLE_STAGE_AGG = "isSingleStageAgg";
Review Comment:
@walterddr this will make more sense once you look at this PR:
https://github.com/apache/pinot/pull/10846
We cannot leverage the final stage hint because we use that to decide when
to use the singleton exchange for aggregations without group-by (to perform
global aggregation step in final). For both of the aggregation hints, skip leaf
aggregation, and partition keys = group by keys, we run the aggregation as a
single stage and must treat the incoming records as the intermediate stage and
not the final stage. That's why we decided to expose this new hint for these
scenarios. We also cannot change the final stage hint to intermediate stage
hint for single stage aggregations because of the need for the singleton
exchange.
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