GitHub user petermaxlee opened a pull request:
https://github.com/apache/spark/pull/13964
[SPARK-16274][SQL] Implement xpath_boolean
## What changes were proposed in this pull request?
This patch implements xpath_boolean expression for Spark SQL, a xpath
function that returns true or false. The implementation is modelled after
Hive's xpath_boolean, except that how the expression handles null inputs. Hive
throws a NullPointerException at runtime if either of the input is null. This
implementation returns null if either of the input is null.
## How was this patch tested?
Added unit tests for expressions (based on Hive's tests and some I added
myself) and an end-to-end test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/petermaxlee/spark SPARK-16274
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13964.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 #13964
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commit 34cda070f62677b6920174cc976107456172aeab
Author: petermaxlee <petermax...@gmail.com>
Date: 2016-06-29T04:09:57Z
[SPARK-16274][SQL] Implement xpath_boolean
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