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From "Bennie Schut (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1126) Missing some Jdbc functionality like getTables getColumns and HiveResultSet.get* methods based on column name.
Date Wed, 21 Jul 2010 13:15:54 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890722#action_12890722

Bennie Schut commented on HIVE-1126:

Ok some more on the synchronized client on getTables.
This discussion on thrift show what I also noticed:

So the way I see it is we have two options. 
1) we synchronize the client calls when we use them (like I already did). This should not
be a problem since you wouldn't expect massive amounts of calls on this.
2) when a call is made to Connection.getMetaData() we should create a new client connection
and thus become thread safe.

Option two has a bit more risk involving connection leaking. I noticed the close() on the
HiveConnection is explicitly calling a "transport.close()" so I could keep track of all the
connections we handout to also close during that close, however how do you cleanup a connection
of a DatabaseMetaData object after it's used? If it's automatically garbage collected then
I'm wondering why we have the explicit close now.


> Missing some Jdbc functionality like getTables getColumns and HiveResultSet.get* methods
based on column name.
> --------------------------------------------------------------------------------------------------------------
>                 Key: HIVE-1126
>                 URL: https://issues.apache.org/jira/browse/HIVE-1126
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Clients
>    Affects Versions: 0.7.0
>            Reporter: Bennie Schut
>            Assignee: Bennie Schut
>            Priority: Minor
>             Fix For: 0.7.0
>         Attachments: HIVE-1126-1.patch, HIVE-1126-2.patch, HIVE-1126.patch, HIVE-1126_patch(0.5.0_source).patch
> I've been using the hive jdbc driver more and more and was missing some functionality
which I added
> HiveDatabaseMetaData.getTables
> Using "show tables" to get the info from hive.
> HiveDatabaseMetaData.getColumns
> Using "describe tablename" to get the columns.
> This makes using something like SQuirreL a lot nicer since you have the list of tables
and just click on the content tab to see what's in the table.
> I also implemented
> HiveResultSet.getObject(String columnName) so you call most get* methods based on the
column name.

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