xndai opened a new pull request #1799: [CALCITE-3785] HepPlanner.belongToDag() doesn't have to use mapDigest… URL: https://github.com/apache/calcite/pull/1799 …ToVertex To test whether or not a vertex belongs to DAG, we can simply do graph.vertexSet().contains(vertex). There's no need to look up in mapDigestToVertex map, which incurs overhead of creating the map key. This problem was amplified by CALCITE-3713.
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