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Posted to issues@spark.apache.org by "Nattavut Sutyanyong (JIRA)" <ji...@apache.org> on 2016/12/12 17:01:58 UTC
[jira] [Commented] (SPARK-18603) Support `OuterReference` in
projection list of IN correlated subqueries
[ https://issues.apache.org/jira/browse/SPARK-18603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742455#comment-15742455 ]
Nattavut Sutyanyong commented on SPARK-18603:
---------------------------------------------
More examples:
{code:sql}
-- A silly subquery
SELECT *
FROM A
WHERE A.a1 IN (SELECT MAX(A.a2) FROM B)
{code}
{code:sql}
SELECT *
FROM A
WHERE A.value IN (SELECT CASE
WHEN A.key1 is not null THEN B.v1
WHEN A.key2 is not null THEN B.v2
ELSE NULL END
FROM B
WHERE A.ID = B.ID)
{code}
> Support `OuterReference` in projection list of IN correlated subqueries
> -----------------------------------------------------------------------
>
> Key: SPARK-18603
> URL: https://issues.apache.org/jira/browse/SPARK-18603
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.0.2
> Reporter: Dongjoon Hyun
>
> This issue aims to allow OuterReference columns in projection lists of IN correlated subqueries.
> *SIMPLE EXAMPLE*
> {code}
> 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
> {code}
> *COMPLEX EXAMPLE*
> {code}
> SELECT *
> FROM t1
> WHERE a IN (SELECT x
> FROM (SELECT b, a + 1 as x, a + b as y
> FROM t2)
> WHERE y > 0)
> {code}
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