Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1586#issuecomment-67377013
Hey @javadba, thanks for all the work on this, especially the time figuring
out the surprisingly complicated semantics for this function. Also, sorry for
the delay with review/merging! I'd love to add this, but right now I'm
concerned that the way we are adding UDFs is unsustainable. I've written up
some thoughts on the right way to proceed in
[SPARK-4867](https://issues.apache.org/jira/browse/SPARK-4867).
Since I'm trying really hard to keep the PR queue small (mostly to help
avoid PRs that languish like this one has been), I propose we close this issue
for now and reopen once the UDF framework has been updated. I've linked your
issue to that one so you or others can use this code as a starting point.
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