GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/14832
[SPARK-17263][SQL] Add hexadecimal literal parsing
## What changes were proposed in this pull request?
This PR adds the ability to parse SQL (hexadecimal) binary literals (AKA
bit strings). It follows the following syntax `X'[Hexadecimal Characters]+'`,
for example: `X'01AB'` would create a binary the following binary array
`0x01AB`.
If an uneven number of hexadecimal characters is passed, then the upper 4
bits of the initial byte are kept empty, and the lower 4 bits are filled using
the first character. For example `X'1C7'` would create the following binary
array `0x01C7`.
Binary data (Array[Byte]) does not have a proper `hashCode` and `equals`
function. This meant that comparing `Literal`s containing binary data was a
pain. I have updated Literal.hashCode and Literal.equals to deal properly with
binary data.
## How was this patch tested?
Added tests to the `ExpressionParserSuite`, `SQLQueryTestSuite` and
`ExpressionSQLBuilderSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-17263
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14832.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 #14832
----
commit 18537858a43e4648d6dd073daa90e2f83528655e
Author: Herman van Hovell <hvanhov...@databricks.com>
Date: 2016-08-26T14:30:14Z
Add hexadecimal literal parsing
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