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Posted to derby-dev@db.apache.org by "Mamta A. Satoor (JIRA)" <ji...@apache.org> on 2013/06/25 05:57:20 UTC
[jira] [Updated] (DERBY-6226) enhance optmizer to use multiple
probes into multiple indexes to satisfy OR queries on different columns.
[ https://issues.apache.org/jira/browse/DERBY-6226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mamta A. Satoor updated DERBY-6226:
-----------------------------------
Urgency: Normal
Labels: derby_triage10_11 (was: )
> enhance optmizer to use multiple probes into multiple indexes to satisfy OR queries on different columns.
> ---------------------------------------------------------------------------------------------------------
>
> Key: DERBY-6226
> URL: https://issues.apache.org/jira/browse/DERBY-6226
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.8.3.1, 10.11.0.0
> Reporter: Mike Matrigali
> Labels: derby_triage10_11
>
> For queries of the type:
> select * from a where col1 = ? or col2 = ?
> and good indexes exist on col1 and col2 it would be optimal if derby could execute a plan that
> did an index scan first on the col1 index and then an index scan on col2 index.
> Currently it looks like derby will do a full index scan if col1 and col2 are in any index, or a full table
> scan otherwise.
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