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Posted to issues@spark.apache.org by "ShuMing Li (JIRA)" <ji...@apache.org> on 2019/07/02 11:08:00 UTC
[jira] [Commented] (SPARK-27877) Implement SQL-standard LATERAL
subqueries
[ 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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