GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/19952
[SPARK-21322][SQL][followup] support histogram in filter cardinality
estimation
## What changes were proposed in this pull request?
some code cleanup/refactor and naming improvement.
## How was this patch tested?
existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark minor
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19952.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 #19952
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commit 3f1f3b1f70ce3f42e0d861a7b37d4e19e7a90d38
Author: Wenchen Fan <[email protected]>
Date: 2017-12-12T14:36:02Z
code cleanup
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