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https://issues.apache.org/jira/browse/HIVE-19951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16519076#comment-16519076
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Matt McCline commented on HIVE-19951:
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[~prasanth_j] I'm considering committing this change first and creating a
follow-on ticket to loosen up the restrictions by checking ORC-380's
isOnlyImplicitConversion() method when the new ORC release goes out...
> Vectorization: Need to disable encoded LLAP I/O for ORC when there is data
> type conversion (Schema Evolution)
> --------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-19951
> URL: https://issues.apache.org/jira/browse/HIVE-19951
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-19951.01.patch
>
>
> Currently, reading encoded ORC data does not support data type conversion.
> So, encoded reading and cache populating needs to be disabled.
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