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This PR supersedes PR #645.
I ran into the fact that the getUDTs method isn't implemented when writing a Slick extension for DuckDB.
This implementation uses a query against
duckdb_types()and maps the DuckDB result columns to the column names required by the JDBC interface definition:database_name -> TYPE_CATschema_name -> TYPE_SCHEMtype_name -> TYPE_NAMEcomment -> REMARKSCLASS_NAMEreturned asNULLThe types themselves are mapped to the base type when a scalar base type is available, but
STRUCTandUNIONdon't have one so it maps toNULL.