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From "Carl Steinbach (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-559) Support JDBC ResultSetMetadata
Date Tue, 08 Jun 2010 23:15:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Carl Steinbach updated HIVE-559:
--------------------------------

    Affects Version/s: 0.5.0

> Support JDBC ResultSetMetadata
> ------------------------------
>
>                 Key: HIVE-559
>                 URL: https://issues.apache.org/jira/browse/HIVE-559
>             Project: Hadoop Hive
>          Issue Type: Sub-task
>          Components: Drivers
>    Affects Versions: 0.5.0
>            Reporter: Bill Graham
>            Assignee: Min Zhou
>
> Support ResultSetMetadata for JDBC ResultSets. The getColumn* methods would be particularly
useful I'd expect:
> http://java.sun.com/javase/6/docs/api/java/sql/ResultSetMetaData.html
> The challenge as I see it though, is that the JDBC client only has access to the raw
query string and the result data when running in standalone mode. Therefore, it will need
to get the column metadata one of two way: 
> 1. By parsing the query to determine the tables/columns involved and then making a request
to the metastore to get the metadata for the columns. This certainly feels like duplicate
work, since the query of course gets properly parsed on the server.
> 2. By returning the column metadata from the server. My thrift knowledge is limited,
but I suspect adding this to the response would present other challenges.
> Any thoughts or suggestions? Option #1 feels clunkier, yet safer.

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