GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/21830
[SPARK-24878][SQL] Fix reverse function for array type of primitive type
containing null.
## What changes were proposed in this pull request?
If we use `reverse` function for array type of primitive type containing
`null` and the child array is `UnsafeArrayData`, the function returns a wrong
result because `UnsafeArrayData` doesn't define the behavior of re-assignment,
especially we can't set a valid value after we set `null`.
## How was this patch tested?
Added some tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark
issues/SPARK-24878/fix_reverse
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21830.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 #21830
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commit 91978e79dd64189e9dbef47d8e8e720a34982d9b
Author: Takuya UESHIN <ueshin@...>
Date: 2018-07-20T16:29:58Z
Fix `reverse` function for array type.
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