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https://issues.apache.org/jira/browse/HIVE-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874948#action_12874948
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Ning Zhang commented on HIVE-1348:
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@namit, please note that with this patch, you can call
ExecMapperContext.inputFileChanged() at any operator to check if the current
row is from a different file than the last row.
> Moving inputFileChanged() from ExecMapper to where it is needed
> ---------------------------------------------------------------
>
> Key: HIVE-1348
> URL: https://issues.apache.org/jira/browse/HIVE-1348
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Ning Zhang
> Assignee: He Yongqiang
> Attachments: hive-1348.1.patch, hive-1348.2.patch, hive-1348.3.patch,
> HIVE-1348.4.patch, HIVE-1348.5.patch
>
>
> inputFileChanged() is only needed for Bucketed sort merge map join. It should
> not be put in ExecMapper.map() where all code paths will hit this function.
> This function is quite expensive since JobConf look up is a hash table look
> up.
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