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From julianhyde <...@git.apache.org>
Subject [GitHub] drill issue #671: DRILL-4347: Propagate distinct row count for joins from lo...
Date Tue, 29 Nov 2016 21:25:39 GMT
Github user julianhyde commented on the issue:

    Yes, CachingRelMetadataProvider is meant for this.
    After https://issues.apache.org/jira/browse/CALCITE-604, providers are considerably more
efficient (not called via reflection), and RelMetadataQuery contains a per-request cache (because
some metadata does change, but slowly).

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