jinxing64 commented on issue #1513: [CALCITE-3421] Reuse relMetadataQuery and fix doc in LogicalCalc URL: https://github.com/apache/calcite/pull/1513#issuecomment-543164064 LGTM. Just one question ~ As discussed on the mailing list `[DISCUSSION] Extension of Metadata Query`, if the lifespan of RelMetadataQuery is a RelOptCall, it seems weird to get a RelMetadataQuery instance from RelOptCluster.
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