dongjoon-hyun commented on PR #43184:
URL: https://github.com/apache/spark/pull/43184#issuecomment-1741845399

   Thank you for review, @viirya .
   
   You are right. We consider them optional, @viirya . 
   > So for users who download Spark from the official website, they are 
required to install these dependencies by themselves, right?
   
   Actually, `pyspark` shell fails to start. So, we need to embed like Py4J.
   > I suppose that you can run PySpark from downloaded distribution without 
packaging if not touching connect and pandas functions.
   
   https://github.com/apache/spark/blob/master/python/lib/py4j-0.10.9.7-src.zip
   
   However, embedding is not a recommendation from the official Python 
community. So, I didn't do that in this PR. I'll handle that usability issue as 
an independent JIRA.


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