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https://issues.apache.org/jira/browse/HIVE-9660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229332#comment-15229332
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Prasanth Jayachandran commented on HIVE-9660:
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Posted some comments in RB. I will have to do another pass to better understand
things in clear mind :).
> store end offset of compressed data for RG in RowIndex in ORC
> -------------------------------------------------------------
>
> Key: HIVE-9660
> URL: https://issues.apache.org/jira/browse/HIVE-9660
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-9660.01.patch, HIVE-9660.02.patch,
> HIVE-9660.03.patch, HIVE-9660.04.patch, HIVE-9660.05.patch, HIVE-9660.patch,
> HIVE-9660.patch
>
>
> Right now the end offset is estimated, which in some cases results in tons of
> extra data being read.
> We can add a separate array to RowIndex (positions_v2?) that stores number of
> compressed buffers for each RG, or end offset, or something, to remove this
> estimation magic
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