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From "Anja Gruenheid (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1940) Query Optimization Using Column Metadata and Histograms
Date Sat, 05 Feb 2011 01:35:30 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990868#comment-12990868
] 

Anja Gruenheid commented on HIVE-1940:
--------------------------------------

I created the metastore as you suggested, but I'm missing a couple of tables like IDXS. I
used MySQL as local database and adjusted the parameters accordingly.
When I create tables, I can see them in the metastore via MySQL, so it definitely is working.

> 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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