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https://issues.apache.org/jira/browse/ORC-54?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333415#comment-15333415
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Matt McCline edited comment on ORC-54 at 6/16/16 9:10 AM:
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Thanks for the heads up. Big change -- seem like it is on a direct collision
course with HIVE-13974 where the reader schema needs to be used for determining
the included array. I need to understand how this relates to Hive. Will Hive
be able to read these tables?
[~hagleitn] [~owen.omalley]
was (Author: mmccline):
Thanks for the heads up. Big change -- seem like it is on a direct collision
course with HIVE-13974 where the reader schema needs to be used for determining
the included array. I need to understand how this relates to Hive. Will Hive
be able to read these tables?
[~hagleitn] [~omalley]
> 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
>
> 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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