xiedeyantu commented on code in PR #4652:
URL: https://github.com/apache/calcite/pull/4652#discussion_r2566707426
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core/src/main/java/org/apache/calcite/rel/RelNode.java:
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@@ -175,6 +177,18 @@ public interface RelNode extends RelOptNode, Cloneable {
*/
void collectVariablesSet(Set<CorrelationId> variableSet);
+ /** Returns a list (one element per input) of {@link ImmutableBitSet}s
+ * listing ordinals of input fields used by this node; the default
+ * implementation returns empty sets. */
+ default List<ImmutableBitSet> getInputFieldsUsed() {
Review Comment:
This draft was indeed not well-considered, and your comments are very useful
to me. I will likely need to refactor this draft, and I will also address the
questions Julian raised in Jira. Apologies, I'll mark it as not ready next time
to save your review time.
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