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https://issues.apache.org/jira/browse/HIVE-15062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616248#comment-15616248
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Sergey Shelukhin commented on HIVE-15062:
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[~thejas] tested it locally by writing to file, removing the value, rebuilding
and reading the file; the unknown value is simply converted to null. It may
break in the cases where the enum field is required, but it is ok for lists.
> create backward compat checking for metastore APIs
> --------------------------------------------------
>
> Key: HIVE-15062
> URL: https://issues.apache.org/jira/browse/HIVE-15062
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15062.01.nogen.patch, HIVE-15062.01.patch,
> HIVE-15062.02.nogen.patch, HIVE-15062.02.patch, HIVE-15062.nogen.patch,
> HIVE-15062.patch
>
>
> This is to add client capability checking to Hive metastore.
> This could have been used, for example, when introducing ACID tables - a
> client trying to get_table on such a table without specifying that it is
> aware of ACID tables would get an error by default.
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