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https://issues.apache.org/jira/browse/ORC-54?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15425915#comment-15425915
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Lefty Leverenz commented on ORC-54:
-----------------------------------
Should this be documented in the wiki?
> Evolve schemas based on field name rather than index
> ----------------------------------------------------
>
> Key: ORC-54
> URL: https://issues.apache.org/jira/browse/ORC-54
> Project: Orc
> Issue Type: Improvement
> Reporter: Mark Wagner
> Assignee: Mark Wagner
> Fix For: 1.2.0
>
>
> Schema evolution as it stands today allows adding fields to the end of
> schemas or removing them from the end. However, because it is based on the
> index of the column, you can only ever add or remove -- not both.
> ORC files have the full schema information of their contents, so there's
> actually enough metadata to support changing columns anywhere in the schema.
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