GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/15230
[SPARK-17657] [SQL] Disallow Users to Change Table Type
### What changes were proposed in this pull request?
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.
### How was this patch tested?
Added test cases
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark alterTableSetExternal
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15230.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15230
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commit f028b5ec4730f658c545b6920e4af79ce5acc957
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2016-09-24T06:02:46Z
fix.
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