Method _check_for_previously_created_column

dask/dataframe/dask_expr/_expr.py:2025–2030

(self, child)

            )

    def _check_for_previously_created_column(self, child):
        input_columns = []
        for v in self.vals:
            if isinstance(v, Expr):
                input_columns.extend(v.columns)
        return bool(set(input_columns) & set(child.keys))

    def _simplify_up(self, parent, dependents):
        if isinstance(parent, Projection):