String representation of the column name using dot-prefixed path notation. For nested fields, the leaf value is what will be present in materialized tables
and expected to match at query time. For example, the leaf node of value.trip_details.location_details.pickup_zip is pickup_zip.
String representation of the column name using dot-prefixed path notation. For nested fields, the leaf value is what will be present in materialized tables and expected to match at query time. For example, the leaf node of value.trip_details.location_details.pickup_zip is pickup_zip.