cannot folder expression - data connector and PostgreSQL

Hi @xsgao_pbi,

I am running into the same problem that you encountered. I created a custom connector to connect to postgres ODBC datasource with direct query enabled.

I get the 'Cannot fold expression to the datasource" error. But once I add the SQLGetTypeInfo and SQLColumns functions, not even able to load data from a table in PBI desktop due to an error - "Expression error - Token literal expected"

Could you please elaborate on your solution. Should the SQLGetTypeInfo function be modified to return only unique types? And any changes required in SQLColumns function?