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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12728) Apply DDL restrictions for ORC schema evolution
Date Tue, 22 Dec 2015 08:12:46 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HIVE-12728:
-----------------------------------------
    Attachment: HIVE-12728.1.patch

> Apply DDL restrictions for ORC schema evolution
> -----------------------------------------------
>
>                 Key: HIVE-12728
>                 URL: https://issues.apache.org/jira/browse/HIVE-12728
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
>            Priority: Critical
>         Attachments: HIVE-12728.1.patch
>
>
> HIVE-11981 added schema evolution for ORC. However, it does not enforce any restrictions
in DDL that can break schema evolution. Following changes have to be enforced in DDL to support
the assumptions in schema evolution (that columns will only be added).
> 1) Restrict changing the file format of the table
> 2) Restrict changing the serde of the table
> 3) Restrict replacing columns
> 4) Restrict reordering columns
> 5) Restrict unsupported type promotions



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