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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7971) Support alter table change/replace/add columns for existing partitions
Date Sat, 04 Oct 2014 23:30:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14159346#comment-14159346
] 

Lefty Leverenz commented on HIVE-7971:
--------------------------------------

Docs are done, removing TODOC14 label.

* [DDL -- Alter Column | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterColumn]

> Support alter table change/replace/add columns for existing partitions
> ----------------------------------------------------------------------
>
>                 Key: HIVE-7971
>                 URL: https://issues.apache.org/jira/browse/HIVE-7971
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>             Fix For: 0.14.0
>
>         Attachments: HIVE-7971.1.patch, HIVE-7971.2.patch, HIVE-7971.3.patch
>
>
> ALTER TABLE CHANGE COLUMN is allowed for tables, but not for partitions. Same for add/replace
columns.
> Allowing this for partitions can be useful in some cases. For example, one user has tables
with Hive 0.12 Decimal columns, which do not specify precision/scale. To be able to properly
read the decimal values from the existing partitions, the column types in the partitions need
to be changed to decimal types with precision/scale.



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