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https://issues.apache.org/jira/browse/HIVE-7513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14099871#comment-14099871
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Alan Gates commented on HIVE-7513:
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+1
> Add ROW__ID VirtualColumn
> -------------------------
>
> Key: HIVE-7513
> URL: https://issues.apache.org/jira/browse/HIVE-7513
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor
> Affects Versions: 0.13.1
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Attachments: HIVE-7513.10.patch, HIVE-7513.11.patch,
> HIVE-7513.12.patch, HIVE-7513.13.patch, HIVE-7513.14.patch,
> HIVE-7513.3.patch, HIVE-7513.4.patch, HIVE-7513.5.patch, HIVE-7513.8.patch,
> HIVE-7513.9.patch, HIVE-7513.codeOnly.txt
>
>
> In order to support Update/Delete we need to read rowId from AcidInputFormat
> and pass that along through the operator pipeline (built from the WHERE
> clause of the SQL Statement) so that it can be written to the delta file by
> the update/delete (sink) operators.
> The parser will add this column to the projection list to make sure it's
> passed along.
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