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https://issues.apache.org/jira/browse/CALCITE-4396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stamatis Zampetakis closed CALCITE-4396.
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Resolution: Duplicate
I am closing this since as it was mentioned before it is a duplicate of
CALCITE-1490. [~danny0405] if you plan to tackle the problem for the next
release I suggest you set the fix version in CALCITE-1490 accordingly.
> Allows table valued functions of FROM and JOIN context without TABLE clause
> ---------------------------------------------------------------------------
>
> Key: CALCITE-4396
> URL: https://issues.apache.org/jira/browse/CALCITE-4396
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.26.0
> Reporter: Danny Chen
> Assignee: Danny Chen
> Priority: Major
> Fix For: 1.27.0
>
>
> In current code base, user can use a table valued function mainly for 2 kinds
> of SQL statements:
> {code:sql}
> -- select from the table valued function directly
> SELECT ... FROM TABLE(my_tvf(...));
> -- join the table valued function with LATERAL keyword
> ... t1 JOIN LATERAL TABLE(my_tvf(...)) ON ...
> {code}
> While since version 12.1+, Oracle supports syntax without TABLE keyword, thus
> you can write SQL as following[1]:
> {code:sql}
> -- select from the table valued function directly
> SELECT ... FROM my_tvf(...);
> -- join the table valued function with LATERAL keyword
> ... t1 JOIN my_tvf(...) ON ...
> {code}
> SQL-SERVER also allows select from the table valued function directly without
> the explicit TABLE keyword, but they need the CROSS APPLY clause for table
> and function join. [2]
> We already had a discussion on the DEV mailing list, see [3].
> I propose to support the Oracle style table valued function syntax: to omit
> the TABLE keyword because the syntax is straight-forward and concise.
> Of course, this syntax is only valid under Oracle SQL conformance.
> [1]
> https://livesql.oracle.com/apex/livesql/file/tutorial_GSOTSK8FWLYZOG5CJJ9KPX7RX.html
> [2]
> https://docs.microsoft.com/en-us/sql/relational-databases/user-defined-functions/create-user-defined-functions-database-engine?view=sql-server-ver15#TVF
> [3]
> https://lists.apache.org/x/thread.html/ra98db08e280ddd9adeef62f456f61aedfdf7756e215cb4d66e2a52c9@%3Cdev.calcite.apache.org%3E
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