When no sources in a union_schema or union_database array have a table (or if the first schema/db in the array doesn't have it?) our models fail, because we are not doing the cast(null as <data_type>) as field_in_table_we_dont_have thing. I think we should add a parameter to the uniondata macro that is a dictionary/json very similar to what we have in the `get
_columns` macros. then union_data could handle the null stuff
see https://github.com/fivetran/dbt_shopify_source/issues/57
When no sources in a union_schema or union_database array have a table (or if the first schema/db in the array doesn't have it?) our models fail, because we are not doing the
cast(null as <data_type>) as field_in_table_we_dont_havething. I think we should add a parameter to the uniondata macro that is a dictionary/json very similar to what we have in the `get