GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/17810
[SPARK-20534][SQL] Make outer generate exec return empty rows
## What changes were proposed in this pull request?
Generate exec does not produce `null` values if the generator for the input
row is empty and the generate operates in outer mode without join. This is
caused by the fact that the `join=false` code path is different from the
`join=true` code path, and that the `join=false` code path did deal with outer
properly. This PR addresses this issue.
## How was this patch tested?
Updated `outer*` tests in `GeneratorFunctionSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-20534
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17810.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 #17810
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commit e1dfe8dcbf8599d837c553810fe9ffca95ffa2ad
Author: Herman van Hovell <hvanhov...@databricks.com>
Date: 2017-04-29T22:01:46Z
Fix interpreted outer generate exec
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