yanlin-Lynn commented on a change in pull request #1533: [CALCITE-3446] Make RelMetadataQuery extensible URL: https://github.com/apache/calcite/pull/1533#discussion_r339886302
########## File path: core/src/main/java/org/apache/calcite/plan/RelOptCluster.java ########## @@ -49,6 +52,7 @@ private MetadataFactory metadataFactory; private final RelTraitSet emptyTraitSet; private RelMetadataQuery mq; + private Supplier<RelMetadataQuery> mqSupplier; Review comment: how about `private Supplier<? extends RelMetadataQuery> mqSupplier;` ? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
