GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/17491
[SQL][WIP] Exists should not be evaluated in Join operator
## What changes were proposed in this pull request?
Similar to `ListQuery`, `Exists` should not be evaluated in `Join` operator
too.
For the `Exists` subquery without correlated reference, this patch converts
it to scalar subquery with a count `Aggregate` operator.
## How was this patch tested?
Jenkins tests.
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/viirya/spark-1 dont-push-exists-to-join
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17491.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 #17491
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commit b012550d6981d3b49aac78432dc42e2974fd3649
Author: Liang-Chi Hsieh <[email protected]>
Date: 2017-03-31T04:07:38Z
Exists should not be evaluated in Join operator too.
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