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From "ShuMing Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-27877) Implement SQL-standard LATERAL subqueries
Date Tue, 02 Jul 2019 11:08:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-27877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16876865#comment-16876865
] 

ShuMing Li commented on SPARK-27877:
------------------------------------

Can this issue assign to me?  Let me do it.

> Implement SQL-standard LATERAL subqueries
> -----------------------------------------
>
>                 Key: SPARK-27877
>                 URL: https://issues.apache.org/jira/browse/SPARK-27877
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Yuming Wang
>            Priority: Major
>
> Subqueries appearing in {{FROM}} can be preceded by the key word {{LATERAL}}. This
allows them to reference columns provided by preceding {{FROM}} items. A trivial example
of {{LATERAL}} is:
> {code:sql}
> SELECT * FROM foo, LATERAL (SELECT * FROM bar WHERE bar.id = foo.bar_id) ss;
> {code}
> More details:
>  [https://www.postgresql.org/docs/9.3/queries-table-expressions.html#QUERIES-LATERAL]
>  [https://github.com/postgres/postgres/commit/5ebaaa49445eb1ba7b299bbea3a477d4e4c0430]



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