The exact query that you shared should work, basically c_abcd!="" would return all the messages with some value populated in this field. If possible you can also add certain Sort and Limit to structure the response.
I tried this out and unfortunately it doesn't seem to work. Our community has a country custom field.
Here I used c_country!="" as a constraint and got back users with no value for c_country.
Then I tried using a specific country as a constraint.
It seems like this should work but apparently you can't use custom fields as LiQL constraints.
Hi Akenefick ,
Thank you for all the investigation you have done, similarly, it is not working for me and I am looking if there's any trick to make it work.
