Method _has_columns

xtop/core/query_builder.py:127–128

(self, source: str, columns: List[str])

        return column.lower() in lookup

    def _has_columns(self, source: str, columns: List[str]) -> bool:
        return all(self._has_column(source, col) for col in columns)

    def _column_expr(self, source: str, alias: str, column: str, output_alias: str) -> str:
        """Return a projection expression respecting schema availability."""