GitHub user mgaido91 opened a pull request:
https://github.com/apache/spark/pull/21605
[SPARK-24385][SQL] Resolve self-join condition ambiguity for EqualNullSafe
## What changes were proposed in this pull request?
In Dataset.join we have a small hack for resolving ambiguity in the column
name for self-joins. The current code supports only `EqualTo`.
The PR extends the fix to `EqualNullSafe`.
Credit for this PR should be given to @daniel-shields.
## How was this patch tested?
added UT
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mgaido91/spark SPARK-24385_2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21605.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 #21605
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