Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/328#discussion_r50302540
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/partition/PruneScanRule.java
 ---
    @@ -78,71 +94,68 @@ public PruneScanRule(RelOptRuleOperand operand, String 
id, OptimizerRulesContext
         this.optimizerContext = optimizerContext;
       }
     
    -  public static final RelOptRule getFilterOnProject(OptimizerRulesContext 
optimizerRulesContext) {
    -    return new PruneScanRule(
    -        RelOptHelper.some(DrillFilterRel.class, 
RelOptHelper.some(DrillProjectRel.class, RelOptHelper.any(DrillScanRel.class))),
    -        "PruneScanRule:Filter_On_Project",
    -        optimizerRulesContext) {
    +  private static class DirPruneScanFilterOnProjectRule extends 
PruneScanRule {
    +    private final boolean calciteLogical;
    --- End diff --
    
    You are right. The flag is not needed now. I will refactor the rules. 


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