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Posted to issues@hive.apache.org by "Eugene Koifman (JIRA)" <ji...@apache.org> on 2018/09/28 17:29:00 UTC

[jira] [Updated] (HIVE-19985) ACID: Skip decoding the ROW__ID sections for read-only queries

     [ https://issues.apache.org/jira/browse/HIVE-19985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eugene Koifman updated HIVE-19985:
----------------------------------
    Attachment: HIVE-19985.06.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, HIVE-19985.04.patch, HIVE-19985.05.patch, HIVE-19985.06.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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