Github user minixalpha commented on the issue:

    https://github.com/apache/spark/pull/19090
  
    @jsnowacki  Thanks for reviewing this PR!  There are some situations people 
cannot omit the quotes, such as multiple parameters of  
"--driver-java-options".  For example: [passing multiple -D arguments to 
driver-java-options in spark-submit on 
windows](https://stackoverflow.com/questions/44578225/passing-multiple-d-arguments-to-driver-java-options-in-spark-submit-on-windows/45972447)
    
    Actually, I find this bug when I try to start a Spark interpreter in Apache 
Zeppelin.  When SPARK_HOME is set, Zeppelin will add some options to 
spark-submit, in these options, there are some quotes, which trigger this bug 
in Windows. I trace the launch process of Spark interpreter and finally I found 
that it is a bug of Spark. Without this bugfix, Zeppelin cannot start Spark 
interpreter when SPARK_HOME is set on Windows.
    
    I will add some comments about these quotes.


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