cannot use credential_provider when passing a DeltaTable obj

Error message

cannot use credential_provider when passing a DeltaTable object

What it means

Error "cannot use credential_provider when passing a DeltaTable object" thrown in pola-rs/polars.

Source

Thrown at py-polars/src/polars/dataframe/frame.py:5020

        _check_for_unsupported_types(self.dtypes)

        if isinstance(target, (str, Path)):
            target = _resolve_delta_lake_uri(str(target), strict=False)

        from polars.io.cloud.credential_provider._builder import (
            _init_credential_provider_builder,
        )
        from polars.io.cloud.credential_provider._providers import (
            _get_credentials_from_provider_expiry_aware,
        )

        if not isinstance(target, DeltaTable):
            credential_provider_builder = _init_credential_provider_builder(
                credential_provider, target, storage_options, "write_delta"
            )
        elif credential_provider is not None and credential_provider != "auto":
            msg = "cannot use credential_provider when passing a DeltaTable object"
            raise ValueError(msg)
        else:
            credential_provider_builder = None

        del credential_provider

        credential_provider_creds = {}

        if credential_provider_builder and (
            provider := credential_provider_builder.build_credential_provider()
        ):
            credential_provider_creds = (
                _get_credentials_from_provider_expiry_aware(provider) or {}
            )

        # We aren't calling into polars-native write functions so we just update
        # the storage_options here.
        storage_options = (
            {**(storage_options or {}), **credential_provider_creds}

View on GitHub (pinned to df599052da)

When it happens

Trigger: Thrown at py-polars/src/polars/dataframe/frame.py:5020 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/3d8fb72ab995c344. Report an issue: GitHub.