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https://issues.apache.org/jira/browse/ORC-644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17162340#comment-17162340
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Owen O'Malley commented on ORC-644:
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[~arvin.zheng] the Apache Iceberg specification is here -
[https://iceberg.apache.org/spec/#schemas-and-data-types]
The relevant part is that they assign field ids to fields so that renaming
fields doesn't cause them to become lost.
> nested struct evolution does not respect to orc.force.positional.evolution
> --------------------------------------------------------------------------
>
> Key: ORC-644
> URL: https://issues.apache.org/jira/browse/ORC-644
> Project: ORC
> Issue Type: Bug
> Components: Java
> Affects Versions: master
> Reporter: Arvin Zheng
> Priority: Major
>
> I noticed that even when orc.force.positional.evolution is set to true, the
> nested Struct evolution is still Hive field name based, which caused some of
> our queries to return incorrect values for fields inside a nested Struct
> since our Hive column name does not match to ORC column name.
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