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https://issues.apache.org/jira/browse/HIVE-14000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330266#comment-15330266
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Matt McCline commented on HIVE-14000:
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About 1/2 the change is eliminating unused members and parameters after row
reading parts of all the tree readers were eliminated.
> (ORC) Changing a numeric type column of a partitioned table to lower type set
> values to something other than 'NULL'
> -------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-14000
> URL: https://issues.apache.org/jira/browse/HIVE-14000
> Project: Hive
> Issue Type: Bug
> Components: Hive, ORC
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-14000.01.patch
>
>
> When an integer column is changed to a type that is smaller (e.g. bigint to
> int) and set hive.metastore.disallow.incompatible.col.type.changes=false, the
> data is clipped instead of being NULL.
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