core__observation missing "code_display"

[comorbidity]

https://github.com/smart-on-fhir/cumulus-library/blob/main/cumulus_library/studies/core/builder_observation.py

Probably what needs to happen is to interlace the LOINC dictionary from UMLS to hydrate Display names.

Example:

{coding=[{code=8713424, display=Temperature, system=https://fhir.cerner.com/96976f07-eccb-424c-9825-e0d0b887148b/codeSet/72, userselected=true, id=null, version=null}, {code=8310-5, display=null, system=http://loinc.org, userselected=null, id=null, version=null}], text=Temperature, id=null}

[dogversioning]

Code/display values are in core__observation_dn_code - we did this to minimize the amount of data in the resource tables (especially observation, since it's huge regardless of what we do). You can always join to this table by code to get the display value if needed, hopefully after you've already filtered observations down.

If that's not sufficient, we can talk about alternate approaches.