Github user jianqiao commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/179#discussion_r99883469
--- Diff: query_optimizer/ExecutionGenerator.hpp ---
@@ -427,7 +445,7 @@ class ExecutionGenerator {
/**
* @brief The cost model to use for estimating aggregation hash table
size.
*/
- std::unique_ptr<cost::CostModel> cost_model_for_aggregation_;
+ std::unique_ptr<cost::StarSchemaSimpleCostModel>
cost_model_for_aggregation_;
--- End diff --
We need some extra analysis done in `StarSchemaSimpleCostModel`. I will
refactor the analysis part out of `StarSchemaSimpleCostModel` into
`AnalysisUtil` in a follow-up PR.
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