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

    https://github.com/apache/drill/pull/519#discussion_r70527515
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/planner/ParquetPartitionDescriptor.java
 ---
    @@ -130,13 +131,13 @@ protected void createPartitionSublists() {
       }
     
       @Override
    -  public TableScan createTableScan(List<PartitionLocation> 
newPartitionLocation) throws Exception {
    +  public TableScan createTableScan(List<PartitionLocation> 
newPartitionLocation, String cacheFileRoot) throws Exception {
    --- End diff --
    
    ParquetPartitionDescriptor does not supportsSinglePartOptimization. Should 
it here throws unsupportedException, and implement 
createTableScan(newPartitionLocation) only? 


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