[jira] [Updated] (IGNITE-4150) B-Tree index cannot be used efficiently with IN clause.

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-4150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-4150:
------------------------------------
    Labels: sql-performance  (was: performance)

> B-Tree index cannot be used efficiently with IN clause.
> -------------------------------------------------------
>
>                 Key: IGNITE-4150
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4150
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 1.7
>            Reporter: Vladimir Ozerov
>            Priority: Major
>              Labels: sql-performance
>             Fix For: 2.5
>
>
> Consider the following query:
> {code}
> SELECT * FROM table
> WHERE a = ? AND b IN (?, ?)
> {code}
> If there is an index {{(a, b)}}, it will not be used properly: only column {{a}} will be used. This will leads to multiple unnecessary comparisons.
> Most obvious way to fix that - use temporary table and {{JOIN}}. However, this approach doesn't work well when there are multiple {{IN}}'s. 
> Proper solution would be to hack deeper into H2.



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