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https://issues.apache.org/jira/browse/HIVE-4312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312592#comment-16312592
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Upendra Yadav commented on HIVE-4312:
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Is there any plan to give this support?
> Make ORC SerDe support replace columns
> --------------------------------------
>
> Key: HIVE-4312
> URL: https://issues.apache.org/jira/browse/HIVE-4312
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Affects Versions: 0.11.0
> Reporter: Kevin Wilfong
>
> In the alterTable method of DDLTask.java there is an explicit list of SerDes
> which support the replace columns command. ORC should support this, at least
> for partitioned tables, maybe not unpartitioned tables.
> This may be as simple as adding it to that list, but I suspect some
> significant changes will be needed to make this work the the
> CombineHiveInputFormat (e.g. where are combined and one split has a column
> stored as a string and in the other it is stored as an int).
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