Github user jianqiao commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/179#discussion_r99867096
--- Diff: query_optimizer/ExecutionGenerator.cpp ---
@@ -371,6 +378,109 @@ void ExecutionGenerator::dropAllTemporaryRelations() {
}
}
+bool ExecutionGenerator::canUseCollisionFreeAggregation(
+ const P::AggregatePtr &aggregate,
+ const std::size_t estimated_num_groups,
+ std::size_t *max_num_groups) const {
+#ifdef QUICKSTEP_DISTRIBUTED
+ // Currently we cannot do this fast path with the distributed setting.
See
+ // the TODOs at InitializeAggregationOperator::getAllWorkOrderProtos()
and
+ // FinalizeAggregationOperator::getAllWorkOrderProtos().
+ return false;
+#endif
+
+ // Supports only single group-by key.
+ if (aggregate->grouping_expressions().size() != 1) {
--- End diff --
Yes we will have a followup PR to improve TPC-H Q01.
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