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Posted to issues@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2018/05/07 15:43:00 UTC
[jira] [Updated] (IGNITE-4150) B-Tree index cannot be used
efficiently with IN clause.
[ https://issues.apache.org/jira/browse/IGNITE-4150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vladimir Ozerov updated IGNITE-4150:
------------------------------------
Fix Version/s: (was: 2.6)
2.5
> 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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