wojustme commented on a change in pull request #2702:
URL: https://github.com/apache/calcite/pull/2702#discussion_r811646787
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File path: core/src/main/java/org/apache/calcite/plan/SubstitutionVisitor.java
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@@ -1671,6 +1677,104 @@ private IntersectOnCalcsToIntersectUnifyRule() {
}
}
+ /**
+ * A {@link SubstitutionVisitor.UnifyRule} that matches a
+ * {@link MutableSort} to a {@link MutableSort} where the query and target
+ * have the same inputs but might not have the same order.
+ */
+ private static class SortToSortUnifyRule extends AbstractUnifyRule {
+
+ public static final SortToSortUnifyRule INSTANCE = new
SortToSortUnifyRule();
+
+ private SortToSortUnifyRule() {
+ super(any(MutableSort.class), any(MutableSort.class), 0);
+ }
+
+ @Override protected @Nullable UnifyResult apply(UnifyRuleCall call) {
+ final MutableSort query = (MutableSort) call.query;
+ final MutableSort target = (MutableSort) call.target;
+ final RelCollation queryCollation = query.collation;
+ final RelCollation targetCollation = target.collation;
Review comment:
OK, Got it.
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