GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/12306
[SPARK-4226][SQL] Support Correlated Sub-queries
### What changes were proposed in this pull request?
This PR adds support for correlated subqueries to Spark. Correlated
sub-queries are typically used as a filtering condition in a query (this is the
only supported use case). A correlated sub-query comes in two forms:
- `[NOT] EXISTS(subquery)`
- `[NOT] IN (subquery)`
This PR is (loosely) based on the work of @davies
(https://github.com/apache/spark/pull/10706) and @chenghao-intel
(https://github.com/apache/spark/pull/9055). They should be credited for the
work they did.
### How was this patch tested?
Modified parsing unit tests.
Added tests to `org.apache.spark.sql.SQLQuerySuite`
cc @rxin, @davies & @chenghao-intel
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-4226
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12306.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 #12306
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commit b2108a99b6595a6ac5bf617827e4d81b3076e755
Author: Herman van Hovell <hvanhov...@questtec.nl>
Date: 2016-04-05T12:09:37Z
Enable Subqueries in parser.
commit 91107e0db752074b487a0a789b551720aa084242
Author: Herman van Hovell <hvanhov...@questtec.nl>
Date: 2016-04-07T05:38:00Z
Merge remote-tracking branch 'apache-github/master' into SPARK-4226
# Conflicts:
#
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
commit 3ac4f4f9f7f917dd9e24c1bc65c7e4af1801d5c9
Author: Herman van Hovell <hvanhov...@questtec.nl>
Date: 2016-04-11T20:46:11Z
Add subquery planning
commit 4d3e2659dd9256b39e468f25b16b31e0aeae1f3a
Author: Herman van Hovell <hvanhov...@questtec.nl>
Date: 2016-04-11T20:54:23Z
Merge remote-tracking branch 'apache-github/master' into SPARK-4226
# Conflicts:
#
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
commit 082bb861b5b76b956dbf7bb6d9ca544bc87c85a7
Author: Herman van Hovell <hvanhov...@questtec.nl>
Date: 2016-04-11T21:04:35Z
Touch-up comment.
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