pola-rs/polars · error · TypeError

Unknown comparison: {op}

Error message

Unknown comparison: {op}

What it means

Error "Unknown comparison: {op}" thrown in pola-rs/polars.

Source

Thrown at py-polars/src/polars/io/iceberg/_utils.py:260

@_convert_predicate.register(Compare)
def _(a: Compare) -> Any:
    op = a.ops[0]
    lhs = _convert_predicate(a.left)[0]
    rhs = _convert_predicate(a.comparators[0])

    if isinstance(op, Gt):
        return pyiceberg.expressions.GreaterThan(lhs, rhs)  # type: ignore[misc, call-arg]
    if isinstance(op, GtE):
        return pyiceberg.expressions.GreaterThanOrEqual(lhs, rhs)  # type: ignore[misc, call-arg]
    if isinstance(op, Eq):
        return pyiceberg.expressions.EqualTo(lhs, rhs)  # type: ignore[misc, call-arg]
    if isinstance(op, Lt):
        return pyiceberg.expressions.LessThan(lhs, rhs)  # type: ignore[misc, call-arg]
    if isinstance(op, LtE):
        return pyiceberg.expressions.LessThanOrEqual(lhs, rhs)  # type: ignore[misc, call-arg]
    else:
        msg = f"Unknown comparison: {op}"
        raise TypeError(msg)


@_convert_predicate.register(List)
def _(a: List) -> Any:
    return [_convert_predicate(e) for e in a.elts]


def extract_field_initial_default(field: NestedField) -> pl.Series | None:
    from pyiceberg.types import (
        UUIDType,
    )

    if field.initial_default is None:
        return None

    value = field.initial_default

    if isinstance(field.field_type, UUIDType):

View on GitHub (pinned to df599052da)

When it happens

Trigger: Thrown at py-polars/src/polars/io/iceberg/_utils.py:260 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/78c6df7b7ea1e3a3. Report an issue: GitHub.