herodu created CALCITE-4521:
-------------------------------
Summary: 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
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, so we want to support user defined table-valued function, just like
the following query:
{code:java}
// code placeholder
select * from table(UDTVF(table Shipments))
{code}
or
{code:java}
// code placeholder
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 user, like:
{code:java}
// code placeholder
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}
// code placeholder
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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