GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/19594
[WIP] [SPARK-21984] Join estimation based on equi-height histogram
## What changes were proposed in this pull request?
This PR depends on other two PRs:
[SPARK-17074](https://github.com/apache/spark/pull/19531) and
[SPARK-22310](https://github.com/apache/spark/pull/19479). I'll update this one
after those two are resolved.
## How was this patch tested?
Added new test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark join_estimation_histogram
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19594.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 #19594
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commit aaa0f77267622757a31bf833e3d3943b7a4faf39
Author: Zhenhua Wang <wangzhen...@huawei.com>
Date: 2017-10-23T02:57:58Z
tmp_generate_histogram
commit 3521cd8c8a5e46a1f5ec9a69a6dad61355b4181b
Author: Zhenhua Wang <wangzhen...@huawei.com>
Date: 2017-10-23T02:59:02Z
tmp_join_est_refactor
commit 67bd65153bd0afcdddd30c6ef4799caa02a05a19
Author: Zhenhua Wang <wangzhen...@huawei.com>
Date: 2017-10-28T01:30:57Z
estimation using equi-height histogram
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