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

["Gautam Kumar Parai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389127#comment-15389127 ] 

Gautam Kumar Parai commented on DRILL-3710:
-------------------------------------------

I have created the pull request (https://github.com/apache/drill/pull/552). [~jni] [~amansinha100] can you please take a look? Thanks!

> 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: Gautam Kumar Parai
>             Fix For: Future
>
>
> 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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