Prasanth Jayachandran created HIVE-12728:
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Summary: 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
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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