zhengchenyu opened a new pull request, #1925:
URL: https://github.com/apache/incubator-uniffle/pull/1925

   ### What changes were proposed in this pull request?
   
   Introduce merger to merge multiple data streams according to key. Minimum 
heap K-way merge sorting is used to merge and sort the data streams that have 
been partially sorted.
   
   ### Why are the changes needed?
   
   Fix: #1747
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   unit test and test in cluster.
   


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