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From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1940) Query Optimization Using Column Metadata and Histograms
Date Fri, 04 Feb 2011 00:26:23 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990411#comment-12990411
] 

John Sichi commented on HIVE-1940:
----------------------------------

If you just svn update to the tip of trunk and build/install from there, you'll get the latest
metastore.  Substantial additions since 0.6 include support for indexes, authorization, and
various database properties.

> Query Optimization Using Column Metadata and Histograms
> -------------------------------------------------------
>
>                 Key: HIVE-1940
>                 URL: https://issues.apache.org/jira/browse/HIVE-1940
>             Project: Hive
>          Issue Type: New Feature
>          Components: Metastore, Query Processor
>            Reporter: Anja Gruenheid
>
> The current basis for cost-based query optimization in Hive is information gathered on
tables and partitions. To make further improvements in query optimization possible, the next
step is to develop and implement possibilities to gather information on columns as discussed
in issue HIVE-33. After that, an implementation of histograms is a possible option to use
and collect run-time statistics. Next to the actual implementation of these features, it is
also necessary to develop a consistent storage model for the MetaStore.

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