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https://issues.apache.org/jira/browse/CALCITE-5168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-5168:
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Labels: pull-request-available (was: )
> Allow AS after parenthesized JOIN
> ---------------------------------
>
> Key: CALCITE-5168
> URL: https://issues.apache.org/jira/browse/CALCITE-5168
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
>
> In CALCITE-35, we added support for parenthesized join, for example
> {code}
> SELECT a.x, b.y, c.z FROM a CROSS JOIN (b CROSS JOIN c)
> {code}
> but the SQL standard and PostgreSQL go further, and allow you to add an alias:
> {code}
> SELECT a.x, d.y, d.z FROM a CROSS JOIN (b CROSS JOIN c) AS d
> {code}
> Note that the second query has "AS d" at the end, and "b.y, c.z" in the
> SELECT clause has changed to "d.y, d.z". The "d" alias obscures the "b" and
> "c" aliases, so "b.y, c.z" would no longer be valid. (If "y" and "z" are not
> unique in "d", the new query would be invalid too.)
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