GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/20135
[SPARK-22937][SQL] SQL elt output binary for binary inputs
## What changes were proposed in this pull request?
This pr modified `elt` to output binary for binary inputs.
`elt` in the current master always output data as a string. But, in some
databases (e.g., MySQL), if all inputs are binary, `elt` also outputs binary
(Also, this might be a small surprise).
This pr is related to #19977.
## How was this patch tested?
Added tests in `SQLQueryTestSuite` and `TypeCoercionSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-22937
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20135.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 #20135
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commit 733043853c5f60eba042af9a9cd05a6e11a199e9
Author: Takeshi Yamamuro <yamamuro@...>
Date: 2018-01-02T13:13:09Z
SQL elt output binary for binary inputs
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