GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/13553
[SPARK-15814][SQL] Aggregator can return null result
## What changes were proposed in this pull request?
It's similar to the bug fixed in
https://github.com/apache/spark/pull/13425, we should consider null object and
wrap the `CreateStruct` with `If` to do null check.
This PR also improves the test framework to test the objects of
`Dataset[T]` directly, instead of calling `toDF` and compare the rows.
## How was this patch tested?
new test in `DatasetAggregatorSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark agg-null
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13553.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 #13553
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commit 34711996028e595a3e42d373a03594404f364802
Author: Wenchen Fan <[email protected]>
Date: 2016-06-08T05:58:04Z
Aggregator can return null result
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