amaliujia commented on a change in pull request #2005:
URL: https://github.com/apache/calcite/pull/2005#discussion_r436186347
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File path:
core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableCorrelate.java
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@@ -81,6 +87,35 @@ public static EnumerableCorrelate create(
traitSet, left, right, correlationId, requiredColumns, joinType);
}
+ @Override public Pair<RelTraitSet, List<RelTraitSet>> passThroughTraits(
+ final RelTraitSet required) {
+ final RelCollation collation = required.getCollation();
+ if (collation == null || collation == RelCollations.EMPTY) {
+ return null;
+ }
Review comment:
Not very familiar with `EnumerableCorrelate`, will it need to deal with
RIGHT OUTER/FULL OUTER JOIN style case?
If so also should return null for those cases.
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