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From hbdeshmukh <...@git.apache.org>
Subject [GitHub] incubator-quickstep issue #96: QUICKSTEP-43 Introduced DestroyAggregationSta...
Date Tue, 23 Aug 2016 20:24:59 GMT
Github user hbdeshmukh commented on the issue:

    https://github.com/apache/incubator-quickstep/pull/96
  
    @zuyu I described the motivation for this operator in the JIRA issue, I will rephrase
it here. 
    
    >
    Background: We use a class called AggregationState that manages the aggregation related
data structures during the execution of a query. At present this class is destroyed through
the FinalizeAggregation work order, which is executed by a single thread.
    >
    In the future, we would like to parallelize the FinalizeAggregation operator. Therefore
for the destruction of the AggregationState, we need for a separate operator. This design
pattern is similar to what is used in HashJoins, where we have a separate DestroyHashOperator.
    >


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