Can I choose not to store the returned values in op, and will they be cleaned up after completion?

Hi @王昊 you could set your I/O manager to the InMemoryIOManager and then all results will be cleaned up after completion

from dagster import Definitions, InMemoryIOManager

defs = Definitions(
    assets=[...],
    resources={
       "io_manager": InMemoryIOManager()
    }
)