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https://issues.apache.org/jira/browse/SPARK-5740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315872#comment-14315872
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Apache Spark commented on SPARK-5740:
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User 'OopsOutOfMemory' has created a pull request for this issue:
https://github.com/apache/spark/pull/4530

> Change default value of comment in DescribeCommand from "null" to “None”
> ------------------------------------------------------------------------
>
>                 Key: SPARK-5740
>                 URL: https://issues.apache.org/jira/browse/SPARK-5740
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.3.0
>            Reporter: Li Sheng
>             Fix For: 1.3.0
>
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> Change default value of comment in DescribeCommand from "null" to "None"
> Filed in Hive Table does not have a comment, when describe the table, this 
> `comment` field should not be "null" but “None”. 
> This is consistent with hive behavior.



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