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

    https://github.com/apache/spark/pull/20487#discussion_r165883842
  
    --- Diff: pom.xml ---
    @@ -185,6 +185,10 @@
         <paranamer.version>2.8</paranamer.version>
         <maven-antrun.version>1.8</maven-antrun.version>
         <commons-crypto.version>1.0.0</commons-crypto.version>
    +    <!--
    +    If you are changing Arrow version specification, please check 
./python/pyspark/sql/utils.py,
    +    ./python/run-tests.py and ./python/setup.py too.
    --- End diff --
    
    Hmmmm .. I thought the proper place to upgrade the versions should be in 
`setup.py` and `pom.xml` so if we happen to update PyArrow (`pom.xml` / 
`setup.py`) or Pandas (`setup.py`), I thought we are going to take a look for 
either place first.
    
    To be honest, I actually don't quite like to write down specific paths in 
those comments because if we happen to move, we should update all the comments 
..


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