yangzhg opened a new issue #3895:
URL: https://github.com/apache/incubator-doris/issues/3895


   In `olap_scan_node.cpp` the  num of  scan thread is base on `split_ranges` 
and it is generated by function `split_range`. This function in 
`beta_rowset.cpp` is  simply return the all data as a single range, this cause 
the scan thread  num is less than alpha rowset. So in some case same query on  
the beta rowset  is much slower than  on alpha rowset.
   So we need to implement `split_range` in  `beta_rowset.cpp` 
   
   


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