Method lower_completely

dask/_expr.py:497–522

Lower an expression completely This calls the ``lower_once`` method in a loop until nothing changes. This function does not apply any other optimizations (like ``simplify``). Returns ------- expr: output expression See Also

(self)

        return lowered.setdefault(self._name, out)

    def lower_completely(self) -> Expr:
        """Lower an expression completely

        This calls the ``lower_once`` method in a loop
        until nothing changes. This function does not
        apply any other optimizations (like ``simplify``).

        Returns
        -------
        expr:
            output expression

        See Also
        --------
        Expr.lower_once
        Expr._lower
        """
        # Lower until nothing changes
        expr = self
        lowered: dict = {}
        while True:
            new = expr.lower_once(lowered)
            if new._name == expr._name:
                break
            expr = new
        return expr

    def _lower(self):
        return