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  1. Hive
  2. HIVE-14096

Extend RS dedup logic to merge GBy operators

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Details

    • Bug
    • Status: Open
    • Major
    • Resolution: Unresolved
    • 2.2.0
    • None
    • Physical Optimizer
    • None

    Description

      Since we always generate map-side GBy at plan generation time, there are occasion when we could collapse GBy after RS dedup optimization. This means that GBy would be executed in a single stage with mode = complete.

      Example in reduce_deduplicate_extended2.q.out:

      SELECT f.key, g.value
FROM src f
JOIN src g ON (f.key = g.key AND f.value = g.value)
GROUP BY g.value, f.key

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          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HIVE-13982 Extensions to RS dedup: execute with different column order and sorting direction if possible

          • Major - Major loss of function.
          • Closed

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              Unassigned Unassigned
              jcamacho Jesús Camacho Rodríguez
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              Dates

                Created:
                Updated: