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https://issues.apache.org/jira/browse/CALCITE-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17299339#comment-17299339
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Danny Chen commented on CALCITE-4521:
-------------------------------------
I guess this issue is not about UDTF but UDTVF, which is a little different,
the latter can pass in table name as parameters and has solid schema.
> Support User Defined Table-valued Function
> ------------------------------------------
>
> Key: CALCITE-4521
> URL: https://issues.apache.org/jira/browse/CALCITE-4521
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: herodu
> Priority: Major
>
> It already support TUMBLE/HOP/SESSION windowing table-valued function in
> current version. But in fact, the table-valued function is not just the
> current features, and we want to support user defined table-valued function,
> just like the following query:
> {code:java}
> select * from table(UDTVF(table Shipments))
> {code}
> or
> {code:java}
> select * from table(UDTVF(select * from Shipments)){code}
> The input parameters of 'UDTVF' is the output rowtype of the inner subquery,
> and the output of 'UDTVF' is defined by users, just like:
> {code:java}
> final TableValuedFunction tableValuedFunction =
> (RelDataTypeFactory typeFactory) -> typeFactory.builder()
> .add("in1", SqlTypeName.INTEGER)
> .add("in2", SqlTypeName.VARCHAR)
> .build();
> {code}
>
> And the expected output logic plan like:
> {code:java}
> LogicalProject(in1=[$0], in2=[$1])
> LogicalTableFunctionScan(invocation=[UDTVF($0, $1)],
> rowType=[RecordType(INTEGER in1,VARCHAR in2)])
> LogicalProject(ORDERID=[$0], ROWTIME=[$1])
> LogicalTableScan(table=[[CATALOG, SALES, SHIPMENTS]])
> {code}
>
>
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