@Override
                public Object read(SourceRecord record,
                        @Nullable TableChanges.TableChange tableSchema, RowData rowData) {
                    // construct canal json
                    return getCanalData(record, (GenericRowData) rowData, tableSchema);
                }
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