Add support for table valued functions for SQL Server #1839
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- formerly, a semicolon after the last statement in a procedure was non-canonical (because they were added via `join`); a `BeginEndStatements` statements list will always write them out - `BeginEndStatements` begin/end tokens won't be written when empty - EOF now concludes parsing a statement list
…tokens - this further consolidates with existing patterns
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Note: temporarily rebased on #1834, prior to that being merged; I will rebase once it's on main.
This PR adds support for table valued functions for SQL Server, both inline & multi statement functions. For reference, that's the B & C documentation here: https://learn.microsoft.com/en-us/sql/t-sql/statements/create-function-transact-sql?view=sql-server-ver16#b-create-an-inline-table-valued-function
Inline TVF's are defined with
AS RETURN, so we have a newCreateFunctionBody::AsReturnvariant accordingly. Functions using "AS RETURN" don't have BEGIN/END, so that part of the parsing logic is now conditional. Additionally, the data type parser now supports "RETURNS TABLE" without a table definition.Multi statement TVF's use named table expressions, so a new
NamedTabledata type variant was added. I didn't see a great way to integrate this into the existing data type parser (especially without rewinding), so creating this data type happens inside the parse create function logic first by parsing the identifier, then parsing the table definition, then using those elements to produce a NamedTable.I also added a new test example for each of these scenarios.