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https://issues.apache.org/jira/browse/HIVE-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12995182#comment-12995182
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Siying Dong commented on HIVE-1517:
-----------------------------------
Namit, Driver.java just lock db of the table when locking any table, which
should be the same reason as you explained "DROP DATABASE does not work while
any table/partition is
being accessed/modified". Also, zookeeper path are something like
/<PREFIX>/db/table_name. Without locking db in advance, parent path is missing
and locking the tables will fail.
> ability to select across a database
> -----------------------------------
>
> Key: HIVE-1517
> URL: https://issues.apache.org/jira/browse/HIVE-1517
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Siying Dong
> Priority: Blocker
> Fix For: 0.7.0
>
> Attachments: HIVE-1517.1.patch.txt, HIVE-1517.2.patch.txt,
> HIVE-1517.3.patch, HIVE-1517.4.patch
>
>
> After https://issues.apache.org/jira/browse/HIVE-675, we need a way to be
> able to select across a database for this feature to be useful.
> For eg:
> use db1
> create table foo(....);
> use db2
> select .. from db1.foo.....
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