Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/15704
  
    Let us think this more carefully. In the following case, in which the 
partition specs have the overlapping range
    ```Scala
    sql("ALTER TABLE sales DROP PARTITION (quarter <= 3), PARTITION (quarter <= 
2)")
    ```
    
    Assuming there is only one partition `quarter = 1`, will Hive issue an 
exception when handling the second spect `PARTITION (quarter <= 2)` after 
completing the first partition. Is the handling of `IF EXISTS` before the 
actual dropping?


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