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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-19985) ACID: Skip decoding the ROW__ID sections for read-only queries
Date Wed, 01 Aug 2018 15:34:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-19985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16565500#comment-16565500
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Jesus Camacho Rodriguez commented on HIVE-19985:
------------------------------------------------

Materialized view rewrite and rebuild may still use the writeID within the ROW__ID, as data
may be filtered based on it. Will that work with this patch? 

> ACID: Skip decoding the ROW__ID sections for read-only queries 
> ---------------------------------------------------------------
>
>                 Key: HIVE-19985
>                 URL: https://issues.apache.org/jira/browse/HIVE-19985
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>            Reporter: Gopal V
>            Assignee: Eugene Koifman
>            Priority: Major
>              Labels: Branch3Candidate
>         Attachments: HIVE-19985.01.patch
>
>
> For a base_n file there are no aborted transactions within the file and if there are
no pending delete deltas, the entire ACID ROW__ID can be skipped for all read-only queries
(i.e SELECT), though it still needs to be projected out for MERGE, UPDATE and DELETE queries.
> This patch tries to entirely ignore the ACID ROW__ID fields for all tables where there
are no possible deletes or aborted transactions for an ACID split.



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