godfreyhe commented on a change in pull request #11340: [Flink 14338] Upgrade
Calcite version to 1.22 for Flink SQL
URL: https://github.com/apache/flink/pull/11340#discussion_r392067810
##########
File path:
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/plan/metadata/FlinkRelMetadataQuery.java
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@@ -34,8 +34,6 @@
*/
public class FlinkRelMetadataQuery extends RelMetadataQuery {
- protected static final FlinkRelMetadataQuery PROTOTYPE = new
FlinkRelMetadataQuery(false);
Review comment:
Not really, the volcano planner will invalidate the metadata query (setting
`FlinkRelMetadataQuery` instance to null through
`RelOptCluster.invalidateMetadataQuery` method) when a rule transforms
successfully. So there are many `FlinkRelMetadataQuery` instances created by
`new FlinkRelMetadataQuery()`
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