title: cassandra:sorting problem，ordering is wrong
body: <p>I have a question about Cassandra. At present, "entities_by_time" is ok on the 18-bit uuid through column1 sorting, but there is something wrong with uuid ascending to the 19-bit sorting. Please help me.</p>
  
  <pre><code>cqlsh:minds&gt; select * from entities_by_time where key='activity:user:990192934408163330' order by column1 desc limit 10;
   key                              | column1            | value
  ----------------------------------+--------------------+--------------------
   activity:user:990192934408163330 | 999979571363188746 | 999979571363188746
   activity:user:990192934408163330 | 999979567064027139 | 999979567064027139
   activity:user:990192934408163330 | 999979562764865555 | 999979562764865555
   activity:user:990192934408163330 | 999979558465703953 | 999979558465703953
   activity:user:990192934408163330 | 999979554170736649 | 999979554170736649
   activity:user:990192934408163330 | 999979549871575047 | 999979549871575047
   activity:user:990192934408163330 | 999979545576607752 | 999979545576607752
   activity:user:990192934408163330 | 999979541290029073 | 999979541290029073
   activity:user:990192934408163330 | 999979536990867461 | 999979536990867461
   activity:user:990192934408163330 | 999979532700094475 | 999979532700094475
  
  cqlsh:minds&gt; select * from entities_by_time where key='activity:user:990192934408163330' order by column1 asc limit 10;
  
   key                              | column1             | value
  ----------------------------------+---------------------+---------------------
   activity:user:990192934408163330 | 1000054880351555598 | 1000054880351555598
   activity:user:990192934408163330 | 1000054884671688706 | 1000054884671688706
   activity:user:990192934408163330 | 1000054888966656017 | 1000054888966656017
   activity:user:990192934408163330 | 1000054893257429005 | 1000054893257429005
   activity:user:990192934408163330 | 1000054897552396308 | 1000054897552396308
   activity:user:990192934408163330 | 1000054901843169290 | 1000054901843169290
   activity:user:990192934408163330 | 1000054906138136577 | 1000054906138136577
   activity:user:990192934408163330 | 1000054910433103883 | 1000054910433103883
   activity:user:990192934408163330 | 1000054914723876869 | 1000054914723876869
   activity:user:990192934408163330 | 1000054919010455568 | 1000054919010455568
  
  
  CREATE TABLE minds.entities_by_time (
      key text,
      column1 text,
      value text,
      PRIMARY KEY (key, column1)
  ) WITH COMPACT STORAGE
      AND CLUSTERING ORDER BY (column1 ASC)
      AND bloom_filter_fp_chance = 0.01
      AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
      AND comment = ''
      AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
      AND compression = {'enabled': 'false'}
      AND crc_check_chance = 1.0
      AND dclocal_read_repair_chance = 0.0
      AND default_time_to_live = 0
      AND gc_grace_seconds = 864000
      AND max_index_interval = 2048
      AND memtable_flush_period_in_ms = 0
      AND min_index_interval = 128
      AND read_repair_chance = 0.1
      AND speculative_retry = '99PERCENTILE';
  </code></pre>
  
  <p>Through inquiry, it is found that in Cassandra, 1007227353832624141 is less than 963426376394739730. Why?</p>