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https://issues.apache.org/jira/browse/HIVE-9660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267073#comment-15267073
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Sergey Shelukhin commented on HIVE-9660:
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Btw, I just realized it would actually not even be cleaner, if I understand it
correctly. You'd need to pass a callback per RG down to the RL writer (and in
some cases there isn't even an RL writer, like double), but RL writer won't
know when a RG ends. So you;d need to tell the RL writer which callback-RGs are
done, and then when RL block ends they can send those down. That seems like a
roundabout way of doing it instead of just coordinating in one place.
> 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-9660.11.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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