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From hakanmemisoglu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #73: Move hash join's probe and build node ...
Date Tue, 02 Aug 2016 08:59:13 GMT
Github user hakanmemisoglu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/73#discussion_r73118755
  
    --- Diff: query_optimizer/rules/SwapProbeBuild.cpp ---
    @@ -0,0 +1,72 @@
    +#include "query_optimizer/rules/SwapProbeBuild.hpp"
    +
    +#include <cstddef>
    +#include <vector>
    +
    +#include "query_optimizer/cost_model/StarSchemaSimpleCostModel.hpp"
    +#include "query_optimizer/expressions/AttributeReference.hpp"
    +#include "query_optimizer/physical/HashJoin.hpp"
    +#include "query_optimizer/physical/PatternMatcher.hpp"
    +#include "query_optimizer/physical/Physical.hpp"
    +#include "query_optimizer/physical/TopLevelPlan.hpp"
    +#include "query_optimizer/rules/Rule.hpp"
    +
    +
    +namespace quickstep {
    +namespace optimizer {
    +
    +P::PhysicalPtr SwapProbeBuild::applyToNode(const P::PhysicalPtr &input) {
    +  P::HashJoinPtr hash_join;
    +
    +  if (P::SomeHashJoin::MatchesWithConditionalCast(input, &hash_join)) {
    +    P::PhysicalPtr left = hash_join->left();
    +    P::PhysicalPtr right = hash_join->right();
    +
    +    P::TopLevelPlanPtr top_level;
    +    if (P::SomeTopLevelPlan::MatchesWithConditionalCast(input, &top_level)) {
    --- End diff --
    
    @jianqiao , Thanks for the catch. 
    
    > In fact, BottomUpRule does not provide a place for initializing cost_model_.
    
    It is the reason why, I have implemented initialization of cost model in "applyToNode".

    I will introduce init(const P::PhysicalPtr &top_level_plan) as you said.


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