rubenada commented on a change in pull request #1918:
URL: https://github.com/apache/calcite/pull/1918#discussion_r417905918
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File path: core/src/main/java/org/apache/calcite/rel/rules/PruneEmptyRules.java
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@@ -277,7 +278,11 @@ private static boolean isEmpty(RelNode node) {
if (sort.fetch != null
&& !(sort.fetch instanceof RexDynamicParam)
&& RexLiteral.intValue(sort.fetch) == 0) {
- call.transformTo(call.builder().push(sort).empty().build());
+ RelNode emptyValues = call.builder().push(sort).empty().build();
+ emptyValues = emptyValues.copy(
+ emptyValues.getTraitSet().replace(sort.getCollation()),
+ Collections.emptyList());
Review comment:
Thanks @danny0405 , I have added a comment in there.
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