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https://issues.apache.org/jira/browse/SPARK-17657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15518556#comment-15518556
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Apache Spark commented on SPARK-17657:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/15230
> Disallow Users to Change Table Type
> ------------------------------------
>
> Key: SPARK-17657
> URL: https://issues.apache.org/jira/browse/SPARK-17657
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0, 2.1.0
> Reporter: Xiao Li
>
> Hive allows users to change the table type from `Managed` to `External` or
> from `External` to `Managed` by altering table's property `EXTERNAL`. See the
> JIRA: https://issues.apache.org/jira/browse/HIVE-1329
> So far, Spark SQL does not correctly support it, although users can do it.
> Many assumptions are broken in the implementation. Thus, this PR is to
> disallow users to do it.
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