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From "Yin Huai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6632) ORC should be able to only read needed fields in a complex column
Date Wed, 12 Mar 2014 16:51:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13931978#comment-13931978
] 

Yin Huai commented on HIVE-6632:
--------------------------------

Does Parquet have the same issue?

> ORC should be able to only read needed fields in a complex column
> -----------------------------------------------------------------
>
>                 Key: HIVE-6632
>                 URL: https://issues.apache.org/jira/browse/HIVE-6632
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Yin Huai
>
> Currently, we use a string of ids to record needed columns. However, this string cannot
record needed fields of a complex column. Although ORC decomposes a complex column to multiple
sub-columns, it has to load the entire complex column if only a single field of this complex
column is needed.



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