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https://issues.apache.org/jira/browse/HIVE-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703606#action_12703606
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Zheng Shao commented on HIVE-352:
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Nice work Yongqiang!
I totally agree with your analysis of the NONBULK mode - I was thinking of
caching all compressed data in memory.
The good thing about NONBULK is that we might be able to bypass the column
hinting - because we might be able to omit the disk read cost since the
decompression cost usually takes much more time.
Can you add a simple option to your code so that I can easily test out whether
that's true? Basically, I want to compare the difference of reading and
decompressing 1 column (while skipping all other columns), and reading all
columns (while decompressing only 1 column). If the difference is small, then
we can implement NONBULK, and skip the column hinting implementation for now.
What do you think?
> Make Hive support column based storage
> --------------------------------------
>
> Key: HIVE-352
> URL: https://issues.apache.org/jira/browse/HIVE-352
> Project: Hadoop Hive
> Issue Type: New Feature
> Reporter: He Yongqiang
> Assignee: He Yongqiang
> Attachments: 4-22 performace2.txt, 4-22 performance.txt, 4-22
> progress.txt, hive-352-2009-4-15.patch, hive-352-2009-4-16.patch,
> hive-352-2009-4-17.patch, hive-352-2009-4-19.patch,
> hive-352-2009-4-22-2.patch, hive-352-2009-4-22.patch,
> hive-352-2009-4-23.patch, hive-352-2009-4-27.patch,
> HIve-352-draft-2009-03-28.patch, Hive-352-draft-2009-03-30.patch
>
>
> column based storage has been proven a better storage layout for OLAP.
> Hive does a great job on raw row oriented storage. In this issue, we will
> enhance hive to support column based storage.
> Acctually we have done some work on column based storage on top of hdfs, i
> think it will need some review and refactoring to port it to Hive.
> Any thoughts?
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