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| author | petermaxlee <petermaxlee@gmail.com> | 2016-06-30 09:27:48 +0800 |
|---|---|---|
| committer | Wenchen Fan <wenchen@databricks.com> | 2016-06-30 09:27:48 +0800 |
| commit | d3af6731fa270842818ed91d6b4d14708ddae2db (patch) | |
| tree | ce2a17e0864be2cf6bc7cde83a451c80ffba3de1 /docs/sql-programming-guide.md | |
| parent | 831a04f5d152d1839c0edfdf65bb728aa5957f16 (diff) | |
| download | spark-d3af6731fa270842818ed91d6b4d14708ddae2db.tar.gz spark-d3af6731fa270842818ed91d6b4d14708ddae2db.tar.bz2 spark-d3af6731fa270842818ed91d6b4d14708ddae2db.zip | |
[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?
Created two new test suites. One for unit tests covering the expression, and the other for end-to-end test in SQL.
Author: petermaxlee <petermaxlee@gmail.com>
Closes #13964 from petermaxlee/SPARK-16274.
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