[CALCITE-7575] Parser can not parse unparsed polymorphic table functions with several table args

[snuyanzin]

Jira Link

CALCITE-7575

Changes Proposed

The PR is to support parsing of queries with PTF (polymorphic table functions) with several table args like

SELECT * FROM TABLE(MY_PTF(
(SELECT * FROM table1) PARTITION BY a,
(SELECT * FROM table2) PARTITION BY b))

[mihaibudiu]

which part of the language reference does this correspond to?

[snuyanzin]

this is SQL:2016 Polymorphic Table Functions (ISO/IEC 9075-2:2016)

the problem with current implementation is that it covers only first arg of table function and doesn't cover any other arg.

[mihaibudiu]

I mean, in the reference.md file

[snuyanzin]

ah, then this line

calcite/site/_docs/reference.md

Lines 2208 to 2209 in 337abd4

	* A polymorphic table function may have multiple input tables. However,
	at most one input table could have row semantics.

[mihaibudiu]

I was looking for PARTITION BY in the grammar, but no place seemed to match what you are not parsing

[snuyanzin]

yeah, seems it is missing details for PTF in reference.md
It was solved (for the first arg) in CALCITE-6944, also a number of references in this comment https://issues.apache.org/jira/browse/CALCITE-6944?focusedCommentId=17945242&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17945242
here I'm following the same approach for other(non-first) args

[mihaibudiu]

Can you then please update the grammar as well?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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