[jira] [Commented] (SPARK-27877) Implement SQL-standard LATERAL subqueries

2019-07-02 Thread Yuming Wang (JIRA) 


[ 
https://issues.apache.org/jira/browse/SPARK-27877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16876909#comment-16876909
 ] 

Yuming Wang commented on SPARK-27877:
-

[~lishuming] tickets are assigned only once the PR is merged. Please go ahead 
submitting the PR: https://github.com/apache/spark/pulls

> 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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[jira] [Commented] (SPARK-27877) Implement SQL-standard LATERAL subqueries

2019-07-02 Thread ShuMing Li (JIRA) 


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