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https://issues.apache.org/jira/browse/HIVE-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994987#comment-12994987
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Anja Gruenheid commented on HIVE-1940:
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I tried figuring out datanucleus and the creation of the initial metastore
model, but I don't quite understand it:
When I create the metastore in MySQL, I generate the jars by running ant
model-jar in the hive/metastore folder. When I then run hive, metastore tables
are generated according the command that I use (eg show tables) in MySQL. I
referenced org.datanucleus.store.rdbms.SchemaTool instead of jpox before
generating the jar file, but it didn't change anything. Basically, there has to
be an overview of all metastore tables that can possibly be invoked. My
question is: where?
Thanks a lot for your help!
> 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
> Attachments: HiveMetaStore.pdf
>
>
> 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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