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  1. Hive
  2. HIVE-19985

ACID: Skip decoding the ROW__ID sections for read-only queries

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.0.0
    • Fix Version/s: 4.0.0
    • Component/s: Transactions
    • Target Version/s:

      Description

      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.

        Attachments

        1. HIVE-19985.01.patch
          10 kB
          Eugene Koifman
        2. HIVE-19985.04.patch
          28 kB
          Eugene Koifman
        3. HIVE-19985.05.patch
          40 kB
          Eugene Koifman
        4. HIVE-19985.06.patch
          33 kB
          Eugene Koifman
        5. HIVE-19985.07.patch
          32 kB
          Eugene Koifman

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              • Assignee:
                ekoifman Eugene Koifman
                Reporter:
                gopalv Gopal Vijayaraghavan
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                Dates

                • Created:
                  Updated:
                  Resolved: