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https://issues.apache.org/jira/browse/HIVE-19985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16560639#comment-16560639
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Gopal V commented on HIVE-19985:
--------------------------------
This patch is LGTM - +1 (after ORC release).
However, this impl does not apply to the setBaseAndInnerReader() passed over
from the LLAP IO elevator case.
> 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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