danny0405 opened a new pull request #1533: [CALCITE-3446] Make RelMetadataQuery extensible URL: https://github.com/apache/calcite/pull/1533 * Add interface RelOptCluster.setMetadataQuery to let user set the customized RelMetadataQuery instance * Add a abstract metadata query class named AbstractRelMetadataQuery, it holds the common parts that a metadata query requires, also add doc about how to add a new RelMetadataQuery sub-class * Add test casts in RelMetadataTest
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