GitHub user srowen opened a pull request:
https://github.com/apache/spark/pull/14504
[SPARK-16409] [SQL] regexp_extract with optional groups causes NPE
## What changes were proposed in this pull request?
regexp_extract actually returns null when it shouldn't when a regex matches
but the requested optional group did not. This makes it return an empty string,
as apparently designed.
## How was this patch tested?
Additional unit test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/srowen/spark SPARK-16409
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14504.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 #14504
----
commit 6259c06d72da9c8350c772dea892fdc96b77fb3d
Author: Sean Owen <so...@cloudera.com>
Date: 2016-08-05T05:33:32Z
Handle case that regex matches, but group does not, in regexp_extract
commit 75d62ae1ce5c33a8c4929aa3500aba1ebb916a09
Author: Sean Owen <so...@cloudera.com>
Date: 2016-08-05T06:20:50Z
Add test for non-matching optional group in regexp_extract
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