GitHub user kiszk opened a pull request:
https://github.com/apache/spark/pull/22269
[SPARK-23997][SQL][Followup] Update exception message
## What changes were proposed in this pull request?
This PR is an follow-up PR of #21087 based on [a discussion
thread](https://github.com/apache/spark/pull/21087#discussion_r211080067].
Since #21087 changed a condition of `if` statement, the message in an exception
is not consistent of the current behavior.
This PR updates the exception message.
## How was this patch tested?
Existing UTs
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kiszk/spark SPARK-23997-followup
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22269.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 #22269
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commit f789450870d0fd88a3b47810a2fcd6efb0b3396a
Author: Kazuaki Ishizaki <ishizaki@...>
Date: 2018-08-29T15:41:49Z
update exception message
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