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Posted to dev@quickstep.apache.org by zuyu <gi...@git.apache.org> on 2017/02/05 19:23:48 UTC

[GitHub] incubator-quickstep issue #179: QUICKSTEP-70-71 Improve aggregation performa...

Github user zuyu commented on the issue:

    https://github.com/apache/incubator-quickstep/pull/179
  
    Hi @jianqiao,
    
    A quick question on Feature 1 using a vector-based aggregation: for a group-by w/ a known bounded range (i.e., the min and max value), do we always choose this approach over the hash-based, or depending on the range size (i.e., if the range is too wide, we may fall back to the hash-based)? Thanks!


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