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

    https://github.com/apache/spark/pull/23053#discussion_r234325912
  
    --- Diff: bin/docker-image-tool.sh ---
    @@ -145,6 +157,8 @@ Options:
       -f file               Dockerfile to build for JVM based Jobs. By default 
builds the Dockerfile shipped with Spark.
       -p file               Dockerfile to build for PySpark Jobs. Builds 
Python dependencies and ships with Spark.
       -R file               Dockerfile to build for SparkR Jobs. Builds R 
dependencies and ships with Spark.
    +  -pskip                Skip building PySpark docker image.
    --- End diff --
    
    I see what you did here.
    
    But it would be better to document this as part of the "-p" and "-R" 
switches.


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