#6275 [Core feature] Support simple dataclass construction from promises in workflow/dynamic Issue created by madwed-stripe Motivation: Why do you think this is important? A common pain point for our systems is the need to add a

create_dataclass

task at the end of a dynamic workflow. It would be wonderful to support dataclass construction from promises in a dynamic (and in a workflow). Goal: What should the final outcome look like, ideally? Here's a simple example of what we need to do today:

@dataclass
class MyCollection:
    values: dict[str, float]


@task
def transform_item(item: float) -> float:
    return 1.0


@task
def make_collection(values: dict[str, float]) -> MyCollection:
    return MyCollection(values)


@dynamic
def transform_collection(collection: MyCollection) -> MyCollection:
    transformed = {k: transform_item(item=v) for k, v in collection.values.items()}
    return make_collection(values=transformed)

We run a ton of these tasks and the host set up time adds up. We'd like to be able to do:

@dynamic
def transform_collection(collection: MyCollection) -> MyCollection:
    transformed = {k: transform_item(item=v) for k, v in collection.values.items()}
    return MyCollection(transformed)

Describe alternatives you've considered Maybe this would be possible with a custom transformer, but I'd rather this be part of flyte core. We could also achieve something like this with

@eager

, but then we need to keep the dynamic host around for the duration of the contained

transform_item

operations and those can take quite a long time. Propose: Link/Inline OR Additional context No response Are you sure this issue hasn't been raised already? • Yes Have you read the Code of Conduct? • Yes flyteorg/flyte