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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2018/08/01 15:34:00 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=16565500#comment-16565500 ]
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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