xiedeyantu commented on code in PR #4827:
URL: https://github.com/apache/calcite/pull/4827#discussion_r2903904390
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core/src/main/java/org/apache/calcite/plan/RelTraitSet.java:
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@@ -375,37 +389,67 @@ public RelTraitSet getDefaultSansConvention() {
* {@link RelDistributionTraitDef#INSTANCE}, or null if the
* {@link RelDistributionTraitDef#INSTANCE} is not registered
* in this traitSet.
+ *
+ * <p>If multiple distribution values are present (a composite trait), the
+ * first one is returned. Use {@link #getTraits(RelTraitDef)} with
+ * {@link RelDistributionTraitDef#INSTANCE} to retrieve all values.
*/
@SuppressWarnings("unchecked")
public <T extends RelDistribution> @Nullable T getDistribution() {
Review Comment:
This was indeed an overlooked point, and I've already made corrections based
on the comments. I'm not sure if this PR will be useful, as it doesn't address
the root cause.
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