GitHub user WeichenXu123 opened a pull request:
https://github.com/apache/spark/pull/15097
[SPARK-17540][SparkR][Spark Core] fix SparkR array serde type problem when
length == 0
## What changes were proposed in this pull request?
fix SparkR array serde type problem when length == 0
when length == 0 mark the data type as NULL,
and scala side will check case element type == NULL and generate
Array[Nothing] with length == 0
because in scala `Nothing` type is sub-type of any other types,
so that scala Array[Nothing] can be assigned to any variable with type
Array[_].
so that this problem can be solved ideally.
## How was this patch tested?
(Please explain how this patch was tested. E.g. unit tests, integration
tests, manual tests)
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/WeichenXu123/spark fix_r_pass_zero_array_type
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15097.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 #15097
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commit 08e011f1d38682dcedc93f4ef8b038ee13fbe5cb
Author: WeichenXu <[email protected]>
Date: 2016-09-14T15:14:59Z
update
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