Adding stubs and making mypy pass

_duckdb-stubs/_func.pyi

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+import typing as pytyping
+
+__all__: list[str] = ["ARROW", "DEFAULT", "NATIVE", "SPECIAL", "FunctionNullHandling", "PythonUDFType"]
+
+class FunctionNullHandling:
+    DEFAULT: pytyping.ClassVar[FunctionNullHandling]  # value = <FunctionNullHandling.DEFAULT: 0>
+    SPECIAL: pytyping.ClassVar[FunctionNullHandling]  # value = <FunctionNullHandling.SPECIAL: 1>
+    __members__: pytyping.ClassVar[
+        dict[str, FunctionNullHandling]
+    ]  # value = {'DEFAULT': <FunctionNullHandling.DEFAULT: 0>, 'SPECIAL': <FunctionNullHandling.SPECIAL: 1>}
+    def __eq__(self, other: object) -> bool: ...
+    def __getstate__(self) -> int: ...
+    def __hash__(self) -> int: ...
+    def __index__(self) -> int: ...
+    def __init__(self, value: pytyping.SupportsInt) -> None: ...
+    def __int__(self) -> int: ...
+    def __ne__(self, other: object) -> bool: ...
+    def __setstate__(self, state: pytyping.SupportsInt) -> None: ...
+    @property
+    def name(self) -> str: ...
+    @property
+    def value(self) -> int: ...
+
+class PythonUDFType:
+    ARROW: pytyping.ClassVar[PythonUDFType]  # value = <PythonUDFType.ARROW: 1>
+    NATIVE: pytyping.ClassVar[PythonUDFType]  # value = <PythonUDFType.NATIVE: 0>
+    __members__: pytyping.ClassVar[
+        dict[str, PythonUDFType]
+    ]  # value = {'NATIVE': <PythonUDFType.NATIVE: 0>, 'ARROW': <PythonUDFType.ARROW: 1>}
+    def __eq__(self, other: object) -> bool: ...
+    def __getstate__(self) -> int: ...
+    def __hash__(self) -> int: ...
+    def __index__(self) -> int: ...
+    def __init__(self, value: pytyping.SupportsInt) -> None: ...
+    def __int__(self) -> int: ...
+    def __ne__(self, other: object) -> bool: ...
+    def __setstate__(self, state: pytyping.SupportsInt) -> None: ...
+    @property
+    def name(self) -> str: ...
+    @property
+    def value(self) -> int: ...
+
+ARROW: PythonUDFType  # value = <PythonUDFType.ARROW: 1>
+DEFAULT: FunctionNullHandling  # value = <FunctionNullHandling.DEFAULT: 0>
+NATIVE: PythonUDFType  # value = <PythonUDFType.NATIVE: 0>
+SPECIAL: FunctionNullHandling  # value = <FunctionNullHandling.SPECIAL: 1>

_duckdb-stubs/_sqltypes.pyi

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+import duckdb
+import typing as pytyping
+
+__all__: list[str] = [
+    "BIGINT",
+    "BIT",
+    "BLOB",
+    "BOOLEAN",
+    "DATE",
+    "DOUBLE",
+    "FLOAT",
+    "HUGEINT",
+    "INTEGER",
+    "INTERVAL",
+    "SMALLINT",
+    "SQLNULL",
+    "TIME",
+    "TIMESTAMP",
+    "TIMESTAMP_MS",
+    "TIMESTAMP_NS",
+    "TIMESTAMP_S",
+    "TIMESTAMP_TZ",
+    "TIME_TZ",
+    "TINYINT",
+    "UBIGINT",
+    "UHUGEINT",
+    "UINTEGER",
+    "USMALLINT",
+    "UTINYINT",
+    "UUID",
+    "VARCHAR",
+    "DuckDBPyType",
+]
+
+class DuckDBPyType:
+    def __eq__(self, other: object) -> bool: ...
+    def __getattr__(self, name: str) -> DuckDBPyType: ...
+    def __getitem__(self, name: str) -> DuckDBPyType: ...
+    def __hash__(self) -> int: ...
+    @pytyping.overload
+    def __init__(self, type_str: str, connection: duckdb.DuckDBPyConnection) -> None: ...
+    @pytyping.overload
+    def __init__(self, obj: object) -> None: ...
+    @property
+    def children(self) -> list[tuple[str, object]]: ...
+    @property
+    def id(self) -> str: ...
+
+BIGINT: DuckDBPyType  # value = BIGINT
+BIT: DuckDBPyType  # value = BIT
+BLOB: DuckDBPyType  # value = BLOB
+BOOLEAN: DuckDBPyType  # value = BOOLEAN
+DATE: DuckDBPyType  # value = DATE
+DOUBLE: DuckDBPyType  # value = DOUBLE
+FLOAT: DuckDBPyType  # value = FLOAT
+HUGEINT: DuckDBPyType  # value = HUGEINT
+INTEGER: DuckDBPyType  # value = INTEGER
+INTERVAL: DuckDBPyType  # value = INTERVAL
+SMALLINT: DuckDBPyType  # value = SMALLINT
+SQLNULL: DuckDBPyType  # value = "NULL"
+TIME: DuckDBPyType  # value = TIME
+TIMESTAMP: DuckDBPyType  # value = TIMESTAMP
+TIMESTAMP_MS: DuckDBPyType  # value = TIMESTAMP_MS
+TIMESTAMP_NS: DuckDBPyType  # value = TIMESTAMP_NS
+TIMESTAMP_S: DuckDBPyType  # value = TIMESTAMP_S
+TIMESTAMP_TZ: DuckDBPyType  # value = TIMESTAMP WITH TIME ZONE
+TIME_TZ: DuckDBPyType  # value = TIME WITH TIME ZONE
+TINYINT: DuckDBPyType  # value = TINYINT
+UBIGINT: DuckDBPyType  # value = UBIGINT
+UHUGEINT: DuckDBPyType  # value = UHUGEINT
+UINTEGER: DuckDBPyType  # value = UINTEGER
+USMALLINT: DuckDBPyType  # value = USMALLINT
+UTINYINT: DuckDBPyType  # value = UTINYINT
+UUID: DuckDBPyType  # value = UUID
+VARCHAR: DuckDBPyType  # value = VARCHAR