@Override
                public Object read(SourceRecord record) {
                    Struct messageStruct = (Struct) record.value();
                    Struct sourceStruct = messageStruct.getStruct(FieldName.SOURCE);
                    return TimestampData.fromEpochMillis(
                            (Long) sourceStruct.get(AbstractSourceInfo.TIMESTAMP_KEY));
                }
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.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/table/MySqlReadableMetadata.java