pub fn default_metadata_column_name(&self) -> Option<&str> {
        match self {
            ExternalSourceConnector::Kafka(_) => Some("mz_offset"),
            ExternalSourceConnector::Kinesis(_) => Some("mz_offset"),
            ExternalSourceConnector::File(_) => Some("mz_line_no"),
            ExternalSourceConnector::AvroOcf(_) => Some("mz_obj_no"),
            ExternalSourceConnector::S3(_) => Some("mz_record"),
            ExternalSourceConnector::Postgres(_) => None,
            ExternalSourceConnector::PubNub(_) => None,
        }
    }
// TODO(bwm): get rid of this when we no longer have the notion of default metadata
get rid of this when we no longer have the notion of default metadata
get rid of this when we no longer have the notion of default metadata
pub fn default_metadata_column_name(&self) -> Option<&str> {
        match self {
            ExternalSourceConnector::Kafka(_) => Some("mz_offset"),
            ExternalSourceConnector::Kinesis(_) => Some("mz_offset"),
            ExternalSourceConnector::File(_) => Some("mz_line_no"),
            ExternalSourceConnector::AvroOcf(_) => Some("mz_obj_no"),
            ExternalSourceConnector::S3(_) => Some("mz_record"),
            ExternalSourceConnector::Postgres(_) => None,
            ExternalSourceConnector::PubNub(_) => None,
        }
    }
pub fn default_metadata_column_name ( & self ) -> Option < & str > { match self { ExternalSourceConnector :: Kafka ( _ ) => Some ( " " ) , ExternalSourceConnector :: Kinesis ( _ ) => Some ( " " ) , ExternalSourceConnector :: File ( _ ) => Some ( " " ) , ExternalSourceConnector :: AvroOcf ( _ ) => Some ( " " ) , ExternalSourceConnector :: S3 ( _ ) => Some ( " " ) , ExternalSourceConnector :: Postgres ( _ ) => None , ExternalSourceConnector :: PubNub ( _ ) => None , } }
TODO(bwm): get rid of this when we no longer have the notion of default metadata
TODO ( bwm ) : get rid of this when we no longer have the notion of default metadata
&self
&self