Schema discovery fails on incremental replications - Coupa

[iamlorax]

Hello!

When making use of source_search_field and source_search_query to incrementally load a stream, the parameter substitution occurs after schema discovery. Thus those two fields are being passed as parameters during the schema discovery GET request: TapRestApiMsdk.get_schema. The result is an exception being thrown for REST APIs that do not allow unknown parameters (ex: Coupa). Example of params:

{'return_object': 'shallow', 'source_search_field': 'updated_at[gt]', 'source_search_query': '$last_run_date'}

Exception:

  File "...\tap_rest_api_msdk\tap.py", line 494, in discover_streams
    schema = self.get_schema(
             ^^^^^^^^^^^^^^^^
  File "...\tap_rest_api_msdk\tap.py", line 618, in get_schema
    raise ValueError(r.text)
ValueError: {"errors":{"request":["I don't understand this attribute: source_search_field. Please make sure it exists and is spelled correctly."]}}