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  1. Hive
  2. HIVE-7926 long-lived daemons for query fragment execution, I/O and caching
  3. HIVE-9757

LLAP: Reuse string dictionaries per column per stripe when processing row groups

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    Details

    • Type: Sub-task
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: llap
    • Fix Version/s: llap
    • Component/s: None
    • Labels:
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      Description

      Dictionary streams are cached by low level cache. When creating column vectors from streams we create dictionary for every row group that we process. We should add per query cache to cache the deserialized representation of dictionary per stripe per column.

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            • Assignee:
              prasanth_j Prasanth Jayachandran
              Reporter:
              prasanth_j Prasanth Jayachandran
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                Updated:
                Resolved: