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Posted to dev@calcite.apache.org by "Liya Fan (Jira)" <ji...@apache.org> on 2020/03/10 12:53:00 UTC

[jira] [Created] (CALCITE-3851) Store nodes with zero importance with a set

Liya Fan created CALCITE-3851:
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             Summary: Store nodes with zero importance with a set
                 Key: CALCITE-3851
                 URL: https://issues.apache.org/jira/browse/CALCITE-3851
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Liya Fan


Currently, volcano planner stores rel node importances with a map. In fact, the value of the map can only be 0. 
So there is no need to store the values, and we replace the map with a set to store nodes whose importances are 0. 

This makes the code logic clearer, and avoids instability caused by comparing floating point values. 



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