GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/1901
[SPARK-2650][SQL] More precise initial buffer size estimation for in-memory
column buffer
This is a follow up of #1880.
Since the row number within a single batch is known, we can estimate a much
more precise initial buffer size when building an in-memory column buffer.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark precise-init-buffer-size
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1901.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 #1901
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commit d5501fa16976aa32903ccdb9364b56b03d750c9b
Author: Cheng Lian <[email protected]>
Date: 2014-08-12T05:54:51Z
More precise initial buffer size estimation for in-memory column buffer
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