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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11981) ORC Schema Evolution Issues (Vectorized, ACID, and Non-Vectorized)
Date Wed, 14 Oct 2015 06:24:05 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt McCline updated HIVE-11981:
--------------------------------
    Attachment: HIVE-11981.03.patch

> ORC Schema Evolution Issues (Vectorized, ACID, and Non-Vectorized)
> ------------------------------------------------------------------
>
>                 Key: HIVE-11981
>                 URL: https://issues.apache.org/jira/browse/HIVE-11981
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive, Transactions
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: HIVE-11981.01.patch, HIVE-11981.02.patch, HIVE-11981.03.patch, ORC
Schema Evolution Issues.docx
>
>
> High priority issues with schema evolution for the ORC file format.
> Schema evolution here is limited to adding new columns and a few cases of column type-widening
(e.g. int to bigint).
> Renaming columns, deleting column, moving columns and other schema evolution were not
pursued due to lack of importance and lack of time.  Also, it appears a much more sophisticated
metadata would be needed to support them.
> The biggest issues for users have been adding new columns for ACID table (HIVE-11421
Support Schema evolution for ACID tables) and vectorization (HIVE-10598 Vectorization borks
when column is added to table).



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