GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/22086
[SPARK-25096][SQL] Loosen nullability if the cast is force-nullable.
## What changes were proposed in this pull request?
In type coercion for complex types, if the found type is force-nullable to
cast, we should loosen the nullability to be able to cast. Also for map key
type, we can't use the type.
## How was this patch tested?
Added some test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark
issues/SPARK-25096/fix_type_coercion
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22086.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 #22086
commit f48035479c248b85519f1bbc7f5b7661c66c0e67
Author: Takuya UESHIN
Date: 2018-08-13T03:28:21Z
Loosen nullability if the cast is force-nullable.
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