Method keys

python/ray/data/namespace_expressions/map_namespace.py:154–165

Returns a list expression containing the keys of the map. Example: >>> from ray.data.expressions import col >>> # Get keys from map column >>> expr = col("headers").map.keys() Returns: A list expression containing the keys.

(self)

    _expr: "Expr"

    def keys(self) -> "UDFExpr":
        """Returns a list expression containing the keys of the map.

        Example:
            >>> from ray.data.expressions import col
            >>> # Get keys from map column
            >>> expr = col("headers").map.keys()

        Returns:
            A list expression containing the keys.
        """
        return self._create_projection_udf(MapComponent.KEYS)

    def values(self) -> "UDFExpr":
        """Returns a list expression containing the values of the map.