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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9660) store end offset of compressed data for RG in RowIndex in ORC
Date Mon, 25 Apr 2016 16:24:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256542#comment-15256542
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Owen O'Malley commented on HIVE-9660:
-------------------------------------

I don't think we need to bump up the writer version for this change, because the reader can
tell if the protobuf has the field or not. WriterVersions are typically reserved for bugs
in the writer where the reader needs to work around bugs.

Can you give a top level view on how you are approaching adding the lengths?


> 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-9660.06.patch, HIVE-9660.07.patch, HIVE-9660.07.patch, HIVE-9660.08.patch,
HIVE-9660.09.patch, HIVE-9660.10.patch, HIVE-9660.10.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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