[jira] [Created] (SPARK-15733) Makes the explain output less verbose by hiding some verbose output like None, null, empty List, and etc..

[Sean Zhong (JIRA)]

Sean Zhong created SPARK-15733:
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             Summary: Makes the explain output less verbose by hiding some 
verbose output like None, null, empty List, and etc..
                 Key: SPARK-15733
                 URL: https://issues.apache.org/jira/browse/SPARK-15733
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Sean Zhong
            Priority: Minor


In the output of {{dataframe.explain()}}, we often see verbose string pattern 
like {{None, [], {}, null, Some(tableName)}}.

For example, for {{spark.sql("show tables").explain()}}, we get:

{code}
== Physical Plan ==
ExecutedCommand
:  +- ShowTablesCommand None, None
{code}

It will be easier to read if we can optimize it to:
{code}
== Physical Plan ==
ExecutedCommand
:  +- ShowTablesCommand
{code}



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