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https://issues.apache.org/jira/browse/HIVE-12728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15068705#comment-15068705
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Prasanth Jayachandran commented on HIVE-12728:
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[~mmccline] and [~hagleitn] Thanks for the review! Addressed both of your
review comments.
> 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-12728.2.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 to not drop columns or do unsupported type
> widening
> 4) Restrict reordering columns
> 5) Restrict unsupported type promotions
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