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Posted to oak-issues@jackrabbit.apache.org by "Thomas Mueller (JIRA)" <ji...@apache.org> on 2012/10/25 16:31:11 UTC

[jira] [Resolved] (OAK-400) The query engine should pick the index with the lowest cost

     [ https://issues.apache.org/jira/browse/OAK-400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Mueller resolved OAK-400.
--------------------------------

    Resolution: Fixed
    
> The query engine should pick the index with the lowest cost
> -----------------------------------------------------------
>
>                 Key: OAK-400
>                 URL: https://issues.apache.org/jira/browse/OAK-400
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>
> Each index implementation must provide an expected cost (estimate how many nodes are read if a given index would be used for a given query).
> The query engine then needs to pick the index(es) with the lowest cost, if multiple indexes are available. If no index can be used, the nodes need to be traversed.

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