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  1. IMPALA
  2. IMPALA-10988

Clarify DEFAULT_JOIN_DISTRIBUTION_MODE Query Option

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    • Documentation
    • Status: Open
    • Minor
    • Resolution: Unresolved
    • Not Applicable
    • None
    • Docs
    • None
    • ghx-label-9

    Description

      https://impala.apache.org/docs/build/html/topics/impala_default_join_distribution_mode.html states:

      This option determines the join distribution that Impala uses when any of the tables involved in a join query is missing statistics.

      However, I think technically, it determines the join distribution when any input of a join has unknown cardinality. Missing statistics, currently, does not always cause unknown cardinality. So we need to correct this statement.

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            Unassigned Unassigned
            thundergun Vincent Tran
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              Created:
              Updated: