GitHub user ron8hu opened a pull request:
https://github.com/apache/spark/pull/17415
[SPARK-19408][SQL] filter estimation on two columns of same table
## What changes were proposed in this pull request?
In SQL queries, we also see predicate expressions involving two columns
such as "column-1 (op) column-2" where column-1 and column-2 belong to same
table. Note that, if column-1 and column-2 belong to different tables, then it
is a join operator's work, NOT a filter operator's work. This PR estimates
filter selectivity on two columns of same table.
## How was this patch tested?
We added 6 new test cases to test various logical predicates involving two
columns of same table.
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ron8hu/spark filterTwoColumns
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17415.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 #17415
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commit 893066905b690c78a127eae58b908dff1dabf7cf
Author: Ron Hu <ron...@huawei.com>
Date: 2017-03-24T20:31:35Z
filter estimation on two columns of same table
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