GitHub user srowen opened a pull request:
https://github.com/apache/spark/pull/14976
[SPARK-17306] [SQL] QuantileSummaries doesn't compress
## What changes were proposed in this pull request?
- Actually call `compress()` in `insert()` when the threshold is exceeded
- Also, avoid using `ArrayBuffer` where all data is prepended, because this
is O(n)
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/srowen/spark SPARK-17306
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14976.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 #14976
----
commit 7226aa0a1ffc689ad7212a02d69c98b79632a086
Author: Sean Owen <so...@cloudera.com>
Date: 2016-09-06T13:53:49Z
Actually call compress() in QuantileSummaries, and avoid expensive
ArrayBuffer.prepend
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