hsyuan commented on a change in pull request #1130: [CALCITE-2865] 
FilterProjectTransposeRule generates wrong traitSet when copyFilter/Project is 
true  
URL: https://github.com/apache/calcite/pull/1130#discussion_r270683245
 
 

 ##########
 File path: 
core/src/main/java/org/apache/calcite/rel/rules/FilterProjectTransposeRule.java
 ##########
 @@ -155,8 +158,12 @@ public void onMatch(RelOptRuleCall call) {
     final RelBuilder relBuilder = call.builder();
     RelNode newFilterRel;
     if (copyFilter) {
-      newFilterRel = filter.copy(filter.getTraitSet(), project.getInput(),
-          simplifyFilterCondition(newCondition, call));
+      final RelNode input = project.getInput();
+      final RelTraitSet traitSet = filter.getTraitSet()
+          .replaceIfs(RelCollationTraitDef.INSTANCE,
 
 Review comment:
   I am not making myself clear. I mean do we need to apply this rule on 
physical operator since it has already been applied on logical operators?

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