[
https://issues.apache.org/jira/browse/HIVE-7513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205807#comment-14205807
]
Eugene Koifman commented on HIVE-7513:
--------------------------------------
I don't think this needs documentation. At the moment this is an internal
implementation detail to support ACID updates.
> 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
> Fix For: 0.14.0
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
