GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/17277
[SPARK-19887][SQL] null is a valid partition value
## What changes were proposed in this pull request?
When partition value is null, we will write the data to a directory like
`a=__HIVE_DEFAULT_PARTITION__`, when we read the data back, we should respect
this special directory name and read null back.
## How was this patch tested?
new regression test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark partition
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17277.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 #17277
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