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https://issues.apache.org/jira/browse/HIVE-4014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13589226#comment-13589226
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Lianhui Wang commented on HIVE-4014:
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hi,Tamas
thank you very much,you are right.
also i think rcfile.reader are not very efficient.
the readed column ids are transfer to rcfile.reader.
> Hive+RCFile is not doing column pruning and reading much more data than
> necessary
> ---------------------------------------------------------------------------------
>
> Key: HIVE-4014
> URL: https://issues.apache.org/jira/browse/HIVE-4014
> Project: Hive
> Issue Type: Bug
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
>
> With even simple projection queries, I see that HDFS bytes read counter
> doesn't show any reduction in the amount of data read.
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