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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