Potentially a bug: Fail to find field_name from input_schema in MixtureOfAgentsConvert

[chjuncn]

When I run
python demos/paperDemo.py --datasetid=biofabric-medium --workload=medical-schema-matching --executor=SEQUENTIAL --policy=maxquality, I got error:

  File "/Users/chjun/Documents/GitHub/code/palimpzest/src/palimpzest/query/operators/mixture_of_agents_convert.py", line 272, in _call_proposer
    proposer_prompt = self._construct_proposer_prompt(fields_to_generate=fields, model=proposer_model)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/chjun/Documents/GitHub/code/palimpzest/src/palimpzest/query/operators/mixture_of_agents_convert.py", line 147, in _construct_proposer_prompt
    field_desc = getattr(self.input_schema, field_name).desc
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'Table' has no attribute 'contents'

The original code is as following:

>         multiline_input_field_description = ""
>         input_fields = (
>             self.input_schema.field_names()
>             if not self.depends_on
>             else [field.split(".")[-1] for field in self.depends_on]
>         )
>         for field_name in input_fields:
>             field_desc = getattr(self.input_schema, field_name).desc
>             multiline_input_field_description += prompts.INPUT_FIELD.format(
>                 field_name=field_name, field_desc=field_desc
>             )

When I tracked the code, I see how we assign node._depends_on in optmizer.py. We basically set all upstream schemas' field to depends_on for the current op.

            # otherwise, make the node depend on all upstream nodes
            node._depends_on = set()
            for upstream_node in dataset_nodes[:node_idx]:
                node._depends_on.update(upstream_node.schema.field_names(unique=True, id=upstream_node.universal_identifier()))
            node._depends_on = list(node._depends_on)

I see you do this intentionally, so not sure about what's wrong.