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Posted to dev@hive.apache.org by "Jason Dere (JIRA)" <ji...@apache.org> on 2014/10/01 00:48:35 UTC

[jira] [Commented] (HIVE-7971) Support alter table change/replace/add columns for existing partitions

    [ https://issues.apache.org/jira/browse/HIVE-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153933#comment-14153933 ] 

Jason Dere commented on HIVE-7971:
----------------------------------

As far as docs, I've updated the VersionInfo at 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
>              Labels: TODOC14
>             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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