[DBAPI2.0] Fix the description attribute
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This was referenced Sep 10, 2025
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evertlammerts
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From the spec it's not clear what type_code is expected to be. Psycopg returns the type's OID and mysql returns a type id, both of which are numbers, but I don't see a good reason to not return a DuckDBPyType...
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… but with a much smaller change
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Fixes https://github.com/duckdblabs/duckdb-internal/issues/1217, duckdb/duckdb#10495
This PR should make a better attempt at implementing https://peps.python.org/pep-0249/#type-objects-and-constructors
We add the required type object sentinels:
STRINGNUMBERDATETIMEBINARYROWID(None, as DuckDB doesn't have a way to detect this on a LogicalType)The objects returned for the
type_codeof thedescriptionis aDuckDBPyType.The sentinels are of type
DBAPITypeObjectand are overloaded to be compared with theDuckDBPyTypeobjects.The constructors listed by the PEP are not added, they could be added in the future.