[jira] Commented: (HIVE-936) dynamic partitions creation based on values

["Jeff Hammerbacher (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778836#action_12778836 ] 

Jeff Hammerbacher commented on HIVE-936:
----------------------------------------

Probably the most requested feature from our customers. Getting a patch in would be a big usability improvement for Hive!

> dynamic partitions creation based on values
> -------------------------------------------
>
>                 Key: HIVE-936
>                 URL: https://issues.apache.org/jira/browse/HIVE-936
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Ning Zhang
>
> If a Hive table is created as partitioned, DML could only inserted into one partitioin per query. Ideally partitions should be created on the fly based on the value of the partition columns. As an example:
> {{{
>   create table T (a int, b string) partitioned by (ds string);
>   insert overwrite table T select a, b, ds from S where ds >= '2009-11-01' and ds <= '2009-11-16';
> }}}
> should be able to execute in one DML rather than possibley 16 DML for each distinct ds values. CTAS and alter table should be able to do the same thing:
> {{{
>   create table T partitioned by (ds string) as select * from S where ds >= '2009-11-01' and ds <= '2009-11-16';
> }}}
>  and
> {{{
>   create table T(a int, b string, ds string);
>   insert overwrite table T select * from S where ds >= '2009-11-1' and ds <= '2009-11-16';
>   alter table T partitioned by (ds);
> }}}
> should all return the same results.

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