danny0405 commented on a change in pull request #1860: [CALCITE-2970] Add
abstractConverter only between derived and required traitset
URL: https://github.com/apache/calcite/pull/1860#discussion_r395431008
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File path: core/src/main/java/org/apache/calcite/rel/RelNode.java
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@@ -407,6 +407,17 @@ RelNode copy(
*/
void register(RelOptPlanner planner);
+ /**
+ * Indicates whether it is an enforcer operator, e.g. PhysicalSort,
+ * PhysicalHashDistribute, etc. As an enforcer, the operator must be
+ * created only when required traitSet is not satisfied by its input.
+ *
+ * @return Whether it is an enforcer operator
+ */
+ default boolean isEnforcer() {
+ return false;
Review comment:
Should we add this default interface ? There is already a default value in
`AbstractRelNode#isEnforcer`.
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