@Override
        public Object read(SourceRecord record) {
            Struct messageStruct = (Struct) record.value();
            return TimestampData.fromEpochMillis((Long) messageStruct.get(FieldName.TIMESTAMP));
        }
It indicates the time that the change was made in the database. If the record is read from
snapshot of the table instead of the binlog, the value is always 0.

Used when data stream is debezium json format.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/table/PostgreSQLReadableMetaData.java