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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2018/06/25 20:20:00 UTC

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

Gopal V created HIVE-19985:
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             Summary: 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


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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