julianhyde commented on a change in pull request #1533: [CALCITE-3446] Make
RelMetadataQuery extensible
URL: https://github.com/apache/calcite/pull/1533#discussion_r340236285
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File path: core/src/main/java/org/apache/calcite/plan/RelOptCluster.java
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@@ -49,6 +52,7 @@
private MetadataFactory metadataFactory;
private final RelTraitSet emptyTraitSet;
private RelMetadataQuery mq;
+ private Supplier<RelMetadataQuery> mqSupplier;
Review comment:
Suppliers are usually final. Any way to make this final?
Have you considered using a memoizing supplier? Guava's
{{Suppliers.memoize}}.
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