def visit_not_starts_with()

in pyiceberg/expressions/visitors.py [0:0]

• 18 lines of code
• 10 McCabe index (conditional complexity)

    def visit_not_starts_with(self, term: BoundTerm[L], literal: Literal[L]) -> bool:
        pos = term.ref().accessor.position
        field = self.partition_fields[pos]
        prefix = str(literal.value)
        len_prefix = len(prefix)

        if field.contains_null or field.lower_bound is None or field.upper_bound is None:
            return ROWS_MIGHT_MATCH

        # not_starts_with will match unless all values must start with the prefix. This happens when
        # the lower and upper bounds both start with the prefix.
        lower = _from_byte_buffer(term.ref().field.field_type, field.lower_bound)
        upper = _from_byte_buffer(term.ref().field.field_type, field.upper_bound)

        if lower is not None and upper is not None:
            # if lower is shorter than the prefix then lower doesn't start with the prefix
            if len(lower) < len_prefix:
                return ROWS_MIGHT_MATCH

            if lower[:len_prefix] == prefix:
                # if upper is shorter than the prefix then upper can't start with the prefix
                if len(upper) < len_prefix:
                    return ROWS_MIGHT_MATCH

                if upper[:len_prefix] == prefix:
                    return ROWS_CANNOT_MATCH

        return ROWS_MIGHT_MATCH