danny0405 opened a new pull request #1802: [CALCITE-3792] Remove the generic type declaration of method URL: https://github.com/apache/calcite/pull/1802 * The type inference of Scala code 'val mq = cluster.getMetadataQuery' is failed if we have that generic type declaration for the Java method * After this change, we need a explicit cast for RelMetadataQuery sub-class * Fix the RelMetadataTest to reset the RelMetadataQuery instance as default after a test * Also rename RelOptCluster#withHintStrategies to setHintStrategies because it does not really return a new copy
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