discovery doesn't generate schema for merge_fields and interests fields/objects

[RuslanBergenov]

In our mailchimp, we have merge_fields object/field with some sub-fields. The following objects/fields are nested inside merge_fields:

• first name
• last name
• address
• phone
• birthday

When we run discovery, subfields names and data type are not being included in schema/tap-catalog file.

I run this command to do schema discovery:
"{my_directory}\venv_mailchimp\Scripts\tap-mailchimp" --config rsc/dt-tap-config.json --discover > dt-tap-catalog-discovery.json

Schema discovery ouputs tap-catalog.json file, which contains the following:

{...
 "merge_fields": {},
...
         "interests": {}
...
 }      

This is a valid json, but it doesn't specify which fields/objects are nested inside merge_fields and interests and their data types. It returns an undefined object with no properties. As a result, we cannot pipe this output into target-bigquery (either data load fails, or it skips merge_fields and interests fields/objects).

We worked around this issue by modifying merge_fields and interests in tap-catalog and specifying that they are a string.

Is it an issue? Is it intentional and by design?