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From "Kevin Wilfong (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-2535) Use sorted nature of compact indexes
Date Wed, 02 Nov 2011 00:07:35 GMT

     [ https://issues.apache.org/jira/browse/HIVE-2535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kevin Wilfong updated HIVE-2535:
--------------------------------

    Attachment: HIVE-2535.2.patch.txt
    
> Use sorted nature of compact indexes
> ------------------------------------
>
>                 Key: HIVE-2535
>                 URL: https://issues.apache.org/jira/browse/HIVE-2535
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-2535.1.patch.txt, HIVE-2535.2.patch.txt
>
>
> Compact indexes are sorted based on the indexed columns, but we are not using this fact
when we access the index.
> To start with, if the index is stored as an RC file, and if the predicate being used
to access the index consists of only one non-partition condition using one of the operators
>,>=,<,<=,= we could use a binary search (if necessary) to find the block to begin
scanning for unfiltered rows, and we could use the result of comparing the value in the column
with the constant (this is necessarily the form of a predicate which is optimized using an
index) to determine when we have found all the rows which will be unfiltered.

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