I want connect to Postgres ODBC data source with direct query enabled. So I took this sample project, https://github.com/Microsoft/DataConnectors/tree/master/samples/ODBC/SqlODBC, point Config_Driver...
We got this fix by adding SQLGetTypeInfo and SQLColumns functions. PostgreSQL ODBC driver returns some duplicate types with same type names, and making them unique fixed the problem - no "cannot fold expression" errors now.