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https://issues.apache.org/jira/browse/ORC-789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei Sun reassigned ORC-789:
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> Supporting schema evolution for union expansion
> -----------------------------------------------
>
> Key: ORC-789
> URL: https://issues.apache.org/jira/browse/ORC-789
> Project: ORC
> Issue Type: Improvement
> Reporter: Lei Sun
> Assignee: Lei Sun
> Priority: Major
>
> We are seeing the following schema evolution occurred from time to time while
> ORC library doesn't seem to support that:
> {code:java}
> Error: org.apache.orc.impl.SchemaEvolution$IllegalEvolutionException: ORC
> does not support type conversion from file type uniontype<(obfuscated List of
> columns),struct<correctPin:string,userInput:string>> to reader type
> uniontype<(obfuscated List of
> columns),struct<correctPin:string,userInput:string>,struct<version:string>>
> {code}
> We would like to add the support.
>
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