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  1. Hive
  2. HIVE-7292 Hive on Spark
  3. HIVE-9045

Choosing right preference between map join and bucket map join [Spark Branch]

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    • Type: Sub-task
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Spark
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      Description

      Currently We convert a join to bucket map join only after it's converted to map join. Supposedly, however, bucket map join has a smaller memory print, so a join which doesn't fit to map join might be suitable for a bucket map join. It would be good if we can take this into consideration when applying join optimizations.

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            • Assignee:
              Unassigned
              Reporter:
              xuefuz Xuefu Zhang
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              • Created:
                Updated: