[jira] [Created] (DRILL-3710) Make the 20 in-list optimization configurable

["Hao Zhu (JIRA)" <ji...@apache.org>]

Hao Zhu created DRILL-3710:
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             Summary: Make the 20 in-list optimization configurable
                 Key: DRILL-3710
                 URL: https://issues.apache.org/jira/browse/DRILL-3710
             Project: Apache Drill
          Issue Type: Improvement
          Components: Query Planning & Optimization
    Affects Versions: 1.1.0
            Reporter: Hao Zhu
            Assignee: Jinfeng Ni


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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