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https://issues.apache.org/jira/browse/HIVE-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496500#comment-13496500
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Carl Steinbach commented on HIVE-3706:
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+1. Please commit if tests pass. Thanks.
> getBoolVar in FileSinkOperator can be optimized
> -----------------------------------------------
>
> Key: HIVE-3706
> URL: https://issues.apache.org/jira/browse/HIVE-3706
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.10.0
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: HIVE-3706.1.patch.txt
>
>
> There's a call to HiveConf.getBoolVar in FileSinkOperator's processOp method.
> In benchmarks we found this call to be using ~2% of the CPU time on simple
> queries, e.g. INSERT OVERWRITE TABLE t1 SELECT * FROM t2;
> This boolean value, a flag to collect the RawDataSize stat, won't change
> during the processing of a query, so we can determine it at initialization
> and store that value, saving that CPU.
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