GitHub user vinodkc opened a pull request:
https://github.com/apache/spark/pull/20917
[SPARK-23705][SQL]Handle non-distinct columns in DataSet.groupBy
## What changes were proposed in this pull request?
If input columns to DataSet.groupBy contains non unique columns, remove
those columns
## How was this patch tested?
Added unit test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vinodkc/spark br_FIX_SPARK-23705
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20917.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 #20917
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