[BUG] flytekit output returns FlyteLiteral instead of Promise

[RRap0so]

Describe the bug

We have a task that outputs the following:

class TaskOutput(NamedTuple):
    uri: str
    ref: str

when we do output.ref it returns a FlyteLiteral instead of the Promise. We believe this is due to a property set in
https://github.com/flyteorg/flytekit/blob/41e21f4de56a837e09101a5cf5dd08ec4e8249df/flytekit/core/promise.py#L503

Expected behavior

Flytekit Output with ref field should return a promise.

Additional context to reproduce

Running this snippet with pyflyte will reproduce the issue

from typing import NamedTuple
from flytekit import task, workflow

class HelloRefOutput(NamedTuple):
  ref: str
  uri: str

@task
def hello_ref() -> HelloRefOutput:
  return HelloRefOutput(ref="hello", uri="world")

@workflow
def hello_ref_workflow() -> str:
  result = hello_ref()
  print(result) # Output(ref=Promise(node:n0.ref), uri=Promise(node:n0.uri))
  print(result.ref) # <FlyteLiteral node_id: "n0" var: "ref"> -- This should be a Promise not a FLyteLiteral
  print(result.uri) # Promise(node:n0.uri) -- OK!

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[eapolinario]

@rafaelraposospot , can you expand a bit more on your use case here? Maybe an example would clarify the intent.

[RRap0so]

Sure thing @eapolinario. I've added an example!