gaodayue opened a new issue #2668: [Compaction] Tablet of a static dataset 
can't be fully compacted into one rowset
URL: https://github.com/apache/incubator-doris/issues/2668
 
 
   **Describe the bug**
   I loaded one static dataset into a Doris table. I expect all tablets to be 
compacted into one rowset after some time since there is no more new data. But 
it turns out all tablets end up having 2 or 3 versions.
   
   ```
   $ curl 
'http://$be:$port/api/compaction/show?tablet_id=12492&schema_hash=1862098505'
   {
       "cumulative point": 229,
       "last cumulative failure time": "2020-01-06 16:39:05.724",
       "last base failure time": "2020-01-06 14:45:37.679",
       "last cumulative success time": "2020-01-02 18:37:35.086",
       "last base success time": "2020-01-02 19:01:21.834",
       "versions": [
           "[0-228] 6 ",
           "[229-229] 1 ",
           "[230-230] 1 "
       ]
   }
   $ curl 
'http://$be:$port/api/compaction/show?tablet_id=12508&schema_hash=1862098505'
   {
       "cumulative point": 230,
       "last cumulative failure time": "2020-01-06 17:56:42.175",
       "last base failure time": "2020-01-06 17:56:45.007",
       "last cumulative success time": "2020-01-02 19:24:21.047",
       "last base success time": "2020-01-02 19:32:26.552",
       "versions": [
           "[0-229] 12 ",
           "[230-230] 2 "
       ]
   }
   ``` 
   
   The reason I want all tablets to be base-compacted into one version is that 
the aggregated table has a long varchar key column which cause the 
merge_iterator to be slow, union_iterator can be utilized to boost query 
performance when there is only one version.
   
   **Environment**
   Latest master branch with default configurations.
   

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