yangzhg opened a new issue #4957:
URL: https://github.com/apache/incubator-doris/issues/4957


   When there are many versions of a table, we have a lot of time spent on 
sorting and merging rowset
   In our scenario, this sorting is actually a merge sorting of multiple 
ordered queues, and usually due to the existence of compapction, we will have a 
relatively large base rowset and several small rowset, so we can combine The 
small rowset is sorted first and merged with the large rowset to optimize the 
read performance


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