GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/13756
[SPARK-16041][SQL] Disallow Duplicate Columns in partitionBy, blockBy and
sortBy in DataFrameWriter
#### What changes were proposed in this pull request?
Duplicate columns are not allowed in `partitionBy`, `blockBy`, `sortBy` in
`DataFrameWriter`. The duplicate columns could cause unpredictable results. For
example, the resolution failure.
This PR is to detect the duplicates and issue exceptions with appropriate
messages.
#### How was this patch tested?
Added test cases in `DataFrameReaderWriterSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark dedup
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13756.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 #13756
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commit 83082ffb9dae922374b2d2f6051cce4bf24cb1de
Author: gatorsmile <[email protected]>
Date: 2016-06-18T05:13:36Z
fix
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