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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