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From "He Yongqiang (JIRA)" <>
Subject [jira] Commented: (HIVE-675) add database/scheme support Hive QL
Date Tue, 22 Sep 2009 15:04:16 GMT


He Yongqiang commented on HIVE-675:

>>Do you want to check for the existence of the location while creating a database -
do we want to throw an error if it already exists.
Currently, it will not throw any error if the database dir is already there. I think this
is the same as creating table. And i always do "drop table" and "create table" stuff, and
i can switch machines, and only need to redo the "create table ..." and the data is available.
I think this is very useful.

>>in create_db_bad_location, can you throw a more meaningful error - location is bad
or something like that 
Actually i already throw an exception with msg "Database location must be an absolute URI.".
But i think the error msg "FAILED: Unknown exception : null" is not unique to this, and i
think it has been reported somewhere in mailist or a jira page.

> add database/scheme support Hive QL
> -----------------------------------
>                 Key: HIVE-675
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Prasad Chakka
>            Assignee: He Yongqiang
>         Attachments: hive-675-2009-9-16.patch, hive-675-2009-9-19.patch, hive-675-2009-9-21.patch,
hive-675-2009-9-7.patch, hive-675-2009-9-8.patch
> Currently all Hive tables reside in single namespace (default). Hive should support multiple
namespaces (databases or schemas) such that users can create tables in their specific namespaces.
These name spaces can have different warehouse directories (with a default naming scheme)
and possibly different properties.
> There is already some support for this in metastore but Hive query parser should have
this feature as well.

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