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Posted to oak-issues@jackrabbit.apache.org by "Amit Jain (JIRA)" <ji...@apache.org> on 2015/09/27 16:16:07 UTC

[jira] [Updated] (OAK-937) Query engine index selection tweaks: shortcut and hint

     [ https://issues.apache.org/jira/browse/OAK-937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amit Jain updated OAK-937:
--------------------------
    Fix Version/s:     (was: 1.3.7)
                   1.3.8

> Query engine index selection tweaks: shortcut and hint
> ------------------------------------------------------
>
>                 Key: OAK-937
>                 URL: https://issues.apache.org/jira/browse/OAK-937
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, query
>            Reporter: Alex Parvulescu
>            Priority: Minor
>              Labels: performance
>             Fix For: 1.3.8
>
>
> This issue covers 2 different changes related to the way the QueryEngine selects a query index:
>  Firstly there could be a way to end the index selection process early via a known constant value: if an index returns a known value token (like -1000) then the query engine would effectively stop iterating through the existing index impls and use that index directly.
>  Secondly it would be nice to be able to specify a desired index (if one is known to perform better) thus skipping the existing selection mechanism (cost calculation and comparison). This could be done via certain query hints [0].
> [0] http://en.wikipedia.org/wiki/Hint_(SQL)



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