[
https://issues.apache.org/jira/browse/HIVE-9660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267223#comment-15267223
]
Owen O'Malley commented on HIVE-9660:
-------------------------------------
Callbacks are only added when a row group finishes, which is the only time that
anyone cares. So nothing happens per a row, only at the row group boundary. The
flow looks like:
start of stripe:
* record position
end of row group:
* create callbacks for each data stream (not the index or dictionary streams)
* record the position for the next row group
end of stripe:
* flush everything to ensure all the callbacks happen
nothing happens per a row or rowbatch.
> 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
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
