pola-rs/polars · error · ValueError

`table_name` appears to be invalid: '{name}'

Error message

`table_name` appears to be invalid: '{name}'

What it means

Error "`table_name` appears to be invalid: '{name}'" thrown in pola-rs/polars.

Source

Thrown at py-polars/src/polars/dataframe/frame.py:4489

            msg = f"write_database `if_table_exists` must be one of {{{allowed}}}, got {if_table_exists!r}"
            raise ValueError(msg)

        connection_module_root = type(connection).__module__.split(".", 1)[0]

        if engine is None:
            if isinstance(connection, str) or connection_module_root == "sqlalchemy":
                engine = "sqlalchemy"
            elif connection_module_root.startswith("adbc"):
                engine = "adbc"

        def unpack_table_name(name: str) -> tuple[str | None, str | None, str]:
            """Unpack optionally qualified table name to catalog/schema/table tuple."""
            from csv import reader as delimited_read

            components: list[str | None] = next(delimited_read([name], delimiter="."))  # type: ignore[arg-type]
            if len(components) > 3:
                msg = f"`table_name` appears to be invalid: '{name}'"
                raise ValueError(msg)
            catalog, schema, tbl = ([None] * (3 - len(components))) + components
            return catalog, schema, tbl  # type: ignore[return-value]

        if engine == "adbc":
            from polars.io.database._utils import (
                _get_adbc_module_name_from_uri,
                _import_optional_adbc_driver,
                _is_adbc_snowflake_conn,
                _open_adbc_connection,
            )

            conn, can_close_conn = (
                (_open_adbc_connection(connection), True)
                if isinstance(connection, str)
                else (connection, False)
            )

            driver_manager = import_optional("adbc_driver_manager")

View on GitHub (pinned to df599052da)

When it happens

Trigger: Thrown at py-polars/src/polars/dataframe/frame.py:4489 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of pola-rs/polars@df599052da (2026-08-16). Data as JSON: /api/errors/461a217115ae0b64. Report an issue: GitHub.