GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/14222
[SPARK-16391][SQL] KeyValueGroupedDataset.reduceGroups should support
partial aggregation
## What changes were proposed in this pull request?
`KeyValueGroupedDataset.reduceGroups` is currently implemented via
`flatMapGroups`, which does not support partial aggregation and so is very
inefficient.
`KeyValueGroupedDataset.reduceGroups` should support partial aggregation.
This PR implements it with `Aggregator`.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 improve-reducegroups
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14222.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 #14222
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commit 11357737ad58a2a6c1ea2e17026669fc138f556c
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-07-15T14:06:41Z
Support partial aggregation for reduceGroups.
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