turboFei removed a comment on issue #24992:  [SPARK-28194][SQL] Judge whether 
to reorder joinKeys to prevent None.get in EnsureRequirements
URL: https://github.com/apache/spark/pull/24992#issuecomment-507135803
 
 
   @maropu 
   It is difficult to judge Set(currentOrderOfKeys) == Set(expectedOrderOfKeys).
   For example:
   ```
   Seq(1, 2, 2, 2) 
   Seq(1, 1, 2, 2)
   Seq(1, 1, 1, 2) 
   ```
   So I add a judgement in `reorder`, when we can not reorder the join keys, 
return the (leftKeys, rightKeys) directly. 

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