GitHub user sinasohangirsc opened a pull request:
https://github.com/apache/spark/pull/16087
[SPARK-18656][SQL] Memory efficient implementation of the
org.apache.spark.sql.execution.stat.StatFunctions#multipleApproxQuantiles
@thunterdb
## What changes were proposed in this pull request?
Creating quantile summaries per partition and then merge together, to be
more memory efficient.
## How was this patch tested?
Passes: ./dev/run-tests
Also ran compared results between the old and new implementation.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sinasohangirsc/spark
sina.sohangir/multipleApproxQuantiles
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16087.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 #16087
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commit 0655ddfc6277f49a5434e922511c67f2fa4f6b54
Author: Sina Sohangir <sina.sohan...@snap.com>
Date: 2016-11-30T20:10:09Z
More memory efficient implementation of the multipleApproxQuantiles
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