@classmethod
    def _create_nullsfirst(cls, column):
        return UnaryExpression(
            _literal_as_text(column), modifier=operators.nullsfirst_op)
A 3-tuple of the visibility of each layer, as bools
dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/sql/elements.py/UnaryExpression._create_nullsfirst--crossover with--dataset/ETHPy150Open glue-viz/glue/glue/viewers/image/qt/rgb_edit.py/RGBEdit.rgb_visible