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https://issues.apache.org/jira/browse/TAJO-539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13880916#comment-13880916
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Hyunsik Choi commented on TAJO-539:
-----------------------------------
According to my benchmark, it significantly reduces memory consumption, and GC
time. For example, it reduces the response time of TPC-H Q3 by 15%, and it also
reduces by 50% the response time of heavy aggregation query that processes 600
million distinct grouping keys.
> Change some EvalNode::eval to directly return a Datum value
> -----------------------------------------------------------
>
> Key: TAJO-539
> URL: https://issues.apache.org/jira/browse/TAJO-539
> Project: Tajo
> Issue Type: Improvement
> Components: operator/expression
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Fix For: 0.8-incubating
>
> Attachments: TAJO-539.patch
>
>
> After TAJO-501, we can ensure that all expressions except for
> AggregationFunctionCallEval can be evaluated by calling once eval() instead
> of calling eval followed by terminate. In addition, current EvalNode
> implementation involves unnecessary memory consumption to keep EvalContext
> for all expressions which are not even aggregation eval.
> If we change EvalNode::eval() to directly return a Datum value, it would be
> reduce the memory consumption and CPU costs.
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