GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/10556
[SPARK-12605] [SQL] [WIP] Pushing Join Predicates Through Union All
When selectivity of Join predicates is high, we can push join through union
all for performance improvement.
**Question**: How to decide the selectivity of Join predicates in Spark
SQL?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark unionAllJoin
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10556.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 #10556
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commit 90dd5f15a554560f25e812da3796ef711fd630f6
Author: gatorsmile <[email protected]>
Date: 2016-01-02T08:15:00Z
join push through unionall
commit b5fa5746934b44bd996e6a1961956c5f676d159d
Author: gatorsmile <[email protected]>
Date: 2016-01-02T17:07:52Z
Merge remote-tracking branch 'upstream/master' into unionAllJoin
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