GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/14576
[SPARK-16391][SQL] ReduceAggregator and partial aggregation for
reduceGroups function - WIP
## What changes were proposed in this pull request?
This patch introduces a new ReduceAggregator interface that is a subclass
of Aggregator. ReduceAggregator only requires a single associative and
commutative reduce function. ReduceAggregator is also used to implement
KeyValueGroupedDataset.reduceGroups in order to support partial aggregation.
I'm mostly leaving this up here for feedback.
## How was this patch tested?
WIP
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark reduceAggregator
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14576.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 #14576
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commit 11357737ad58a2a6c1ea2e17026669fc138f556c
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-07-15T14:06:41Z
Support partial aggregation for reduceGroups.
commit 7e8d8c116552642573cc89bd11fc2e82f2a0f82a
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-07-18T08:45:32Z
Add ReduceAggregator.
commit 9de56ee3215d2eaa48c5951b2e5a00dc479d46ea
Author: Reynold Xin <[email protected]>
Date: 2016-07-19T06:14:08Z
Merge pull request #14222 from viirya/improve-reducegroups
[SPARK-16391][SQL] KeyValueGroupedDataset.reduceGroups should support
partial aggregation
commit 53d4879e290c32d3565d504e96c8302e0fceff9b
Author: Reynold Xin <[email protected]>
Date: 2016-07-19T17:31:00Z
initial checkin
commit f9cee8268c31cfce53e186d4135e4210cde03d1d
Author: Reynold Xin <[email protected]>
Date: 2016-08-10T05:39:31Z
Merge branch 'master' into reduceAggregator
commit 19b00f55f1f66b4170ece328b5039e6bbbfa2209
Author: Reynold Xin <[email protected]>
Date: 2016-08-10T05:45:53Z
Updated some comments
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