Github user chunhui-shi commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1198#discussion_r178364263
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillReduceAggregatesRule.java
 ---
    @@ -218,7 +218,8 @@ private void reduceAggs(
             RelOptUtil.createProject(
                 newAggRel,
                 projList,
    -            oldAggRel.getRowType().getFieldNames());
    +            oldAggRel.getRowType().getFieldNames(),
    +            DrillRelFactories.LOGICAL_BUILDER);
    --- End diff --
    
    Could you explain why we are using DrillRelFactories.LOGICAL_BUILDER but 
not relBuilderFactory that was used in line 211? And could you point me to this 
4 param createProject method with Factory as the last param?


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