GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/15030
[SPARK-17474] [SQL] fix python udf in TakeOrderedAndProjectExec
## What changes were proposed in this pull request?
When there is any Python UDF in the Project between Sort and Limit, it will
be collected into TakeOrderedAndProjectExec, ExtractPythonUDFs failed to pull
the Python UDFs out because QueryPlan.expressions does not include the
expression inside Option[Seq[Expression]].
Ideally, we should fix the `QueryPlan.expressions`, but tried with no luck
(it always run into infinite loop). In PR, I changed the
TakeOrderedAndProjectExec to no use Option[Seq[Expression]] to workaround it.
cc @JoshRosen
## How was this patch tested?
Added regression test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark all_expr
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15030.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 #15030
----
commit 3ea0daf9114ec23c81d84f44ce94ee37aca5e55e
Author: Davies Liu <[email protected]>
Date: 2016-09-09T18:59:29Z
fix python udf in TakeOrderedAndProjectExec
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