beyond1920 opened a new pull request, #2844:
URL: https://github.com/apache/calcite/pull/2844
## What is the purpose of the change
This pr aims to extend table function to support Polymorphic Table Function.
## Brief change log
- Update `Parser.jj` to support partition by clause and order by clause
for input table with set semantics of PTF
- Introduce `TableCharacteristics` which contains three characteristics of
input table of table function
- Update `SqlTableFunction` to add a method `tableCharacteristics`, the
method returns the table characteristics for the ordinal-th argument to this
table function. Default return value is Optional.empty which means the
ordinal-th argument is not table.
- Introduce `SqlSetSemanticsTable` which represents input table with set
semantics of Table Function, its `SqlKind` is `SET_SEMANTICS_TABLE`
- Updates `SqlValidatorImpl` to validate only set semantic table of Table
Function could have partition by and order by clause
- Update `SqlToRelConverter#substituteSubQuery` to parse subQuery which
represents set semantics table.
## Verifying this change
- Add tests in `SqlToRelConveterTest`, `SqlValidatorTest`
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