GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/11190
[SPARK-13306] [SQL] uncorrelated scalar subquery
A scalar subquery is a subquery that only generate single row and single
column, could be used as part of expression. Uncorrelated scalar subquery means
it does not has a reference to external table.
All the uncorrelated scalar subqueries will be executed during prepare() of
SparkPlan.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark scalar_subquery
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11190.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 #11190
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commit 0665a69752998206d8bc0d35a4f0cfc390492ab9
Author: Davies Liu <[email protected]>
Date: 2016-02-12T22:09:45Z
uncorrelated scalar subquery
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