Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/49#discussion_r69975485
--- Diff: query_optimizer/cost_model/SimpleCostModel.hpp ---
@@ -88,6 +89,10 @@ class SimpleCostModel : public CostModel {
std::size_t estimateCardinalityForAggregate(
const physical::AggregatePtr &physical_plan);
+ // Return the estimated cardinality of the input plan
--- End diff --
Code style: Add the period `.` in the end.
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