GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/16012
[SPARK-17251][SQL] Support `OuterReference` in projection list of a
correlated subquery
## What changes were proposed in this pull request?
Currently, correlated subqueries does not allow `OuterReference` columns in
projection lists. This PR aims to support that by making `OuterReference` as
`NamedExpression` and extending `pullOutCorrelatedPredicates` into
`pullOutCorrelatedProjectionAndPredicates`.
```scala
scala> sql("CREATE TEMPORARY VIEW t1 AS SELECT * FROM VALUES 1, 2 AS t1(a)")
scala> sql("CREATE TEMPORARY VIEW t2 AS SELECT * FROM VALUES 1 AS t2(b)")
scala> sql("SELECT a FROM t1 WHERE a IN (SELECT a FROM t2)").show
java.lang.ClassCastException:
org.apache.spark.sql.catalyst.expressions.OuterReference cannot be cast to
org.apache.spark.sql.catalyst.expressions.NamedExpression
```
## How was this patch tested?
Pass the Jenkins test with new test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-17251
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16012.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 #16012
----
commit 58449b317f9a04e5cba2f106afede19dbfde953e
Author: Dongjoon Hyun <[email protected]>
Date: 2016-11-24T22:15:04Z
[SPARK-17251][SQL] Support `OuterReference` in projection list of a
correlated subquery
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