liyafan82 opened a new pull request #1853: [CALCITE-3851] Store nodes with zero importance with a set URL: https://github.com/apache/calcite/pull/1853 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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