GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/22787
[SPARK-25040][SQL] Empty string for non string types should be disallowed
## What changes were proposed in this pull request?
This takes over original PR at #22019. The original proposal is to have
null for float and double types. Later a more reasonable proposal is to
disallow empty strings. This patch adds logic to throw exception when finding
empty strings for non string types.
## How was this patch tested?
Added test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-25040
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22787.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 #22787
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commit 45aacaf916826eb8509c85c056b985172d0e2f50
Author: Liang-Chi Hsieh <viirya@...>
Date: 2018-10-21T12:57:26Z
Disallow empty strings on non string types.
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