HappenLee opened a new pull request #3665:
URL: https://github.com/apache/incubator-doris/pull/3665


   1. Delete the code of Sort Node we do not use now.
   2. Optimize the quick sort by find_the_median and try to reduce recursion 
level of quick sort.
   
   I have tested 50 million pieces of data sort.   ordered, disordered and 
reversed order 
   there is improved by about 10%


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