hsyuan commented on a change in pull request #1912:
URL: https://github.com/apache/calcite/pull/1912#discussion_r411467170
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File path: core/src/main/java/org/apache/calcite/plan/RelTrait.java
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@@ -85,4 +87,14 @@
* @param planner Planner
*/
void register(RelOptPlanner planner);
+
+ /**
+ * Applies a mapping to this trait.
+ *
+ * @param mapping Mapping
+ * @return trait with mapping applied
+ */
+ default <T extends RelTrait> T apply(Mappings.TargetMapping mapping) {
Review comment:
Can I have your use cases?
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