def desc(expr):
    if not isinstance(expr, Expr):
        return _ops.DeferredSortKey(expr, ascending=False)
    else:
        return _ops.SortKey(expr, ascending=False).to_expr()
Callback to use with `async_aws_sts`. The 'provider' arg is a
dataset/ETHPy150Open cloudera/ibis/ibis/expr/api.py/desc--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/asyncdynamo.py/AsyncDynamoDB._update_session_token_cb