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From "Prasanth Jayachandran (JIRA)" <>
Subject [jira] [Created] (HIVE-12728) Apply DDL restrictions for ORC schema evolution
Date Tue, 22 Dec 2015 06:51:46 GMT
Prasanth Jayachandran created HIVE-12728:

             Summary: Apply DDL restrictions for ORC schema evolution
                 Key: HIVE-12728
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.0.0, 2.1.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran
            Priority: Critical

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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