GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/20149
[SPARK-22771][SQL] Add a missing return statement in
Concat.checkInputDataTypes
## What changes were proposed in this pull request?
This pr is a follow-up to fix a bug left in #19977.
## How was this patch tested?
Added tests in `StringExpressionsSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-22771-FOLLOWUP
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20149.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 #20149
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commit 2b385ac66e33bb18b651ddd6489bd691074960a6
Author: Takeshi Yamamuro <yamamuro@...>
Date: 2018-01-04T06:43:50Z
Fix a bug
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