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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1133) Refactor InputFormat and OutputFormat for Hive
Date Fri, 05 Feb 2010 18:26:27 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830214#action_12830214
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Ning Zhang commented on HIVE-1133:
----------------------------------

R4 (pushing down simple predicates) is also useful for RCFile or any FileFormat internal to
Hive since we can implement a faster "search-based" HiveRecordReader that takes a set of predicates
and only returns satisfying records. 

> Refactor InputFormat and OutputFormat for Hive
> ----------------------------------------------
>
>                 Key: HIVE-1133
>                 URL: https://issues.apache.org/jira/browse/HIVE-1133
>             Project: Hadoop Hive
>          Issue Type: Improvement
>    Affects Versions: 0.6.0
>            Reporter: Zheng Shao
>
> Currently we ran into several problems of the FileInputFormat/OutputFormat in Hive.
> The requirements are:
> R1. We want to support HBase: HIVE-806
> R2. We want to selectively include files based on file names: HIVE-951
> R3. We want to optionally choose to recurse on the directory structure: HIVE-1083
> R4. We want to pass the filter condition into the storage (very useful for HBase, and
indexed data format)
> R5. We want to pass the column selection information into the storage (already done as
part of the RCFile, but we can do it better)
> We need to structure these requirements and the code structure in a good way to make
it extensible.

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