GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/8750
[SPARK-10588][SQL] Saving a DataFrame containing only nulls to JSON should
work
JIRA: https://issues.apache.org/jira/browse/SPARK-10588
Currently we don't output null fields in StructType. This patch fixes it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 fix-json-null
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8750.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 #8750
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commit ac49c25bc9fa65a8279ecf52326d988fd1fd4772
Author: Liang-Chi Hsieh <[email protected]>
Date: 2015-09-14T17:01:29Z
Saving a DataFrame containing only nulls to JSON should work.
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