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  1. Apache Drill
  2. DRILL-3710

Make the 20 in-list optimization configurable

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 1.1.0
    • 1.8.0
    • None

    Description

      If Drill has more than 20 in-lists , Drill can do an optimization to convert that in-lists into a small hash table in memory, and then do a table join instead.
      This can improve the performance of the query which has many in-lists.
      Could we make "20" configurable? So that we do not need to add duplicate/junk in-list to make it more than 20.

      Sample query is :
      select count from table where col in (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1);

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            gparai Gautam Parai
            haozhu Hao Zhu
            Chun Chang Chun Chang
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