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From "Davide Giannella (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-7390) QueryResult.getSize() can be slow for many "or" or "union" conditions
Date Wed, 09 Jan 2019 17:07:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-7390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Davide Giannella updated OAK-7390:
----------------------------------
    Fix Version/s:     (was: 1.10.0)

> QueryResult.getSize() can be slow for many "or" or "union" conditions
> ---------------------------------------------------------------------
>
>                 Key: OAK-7390
>                 URL: https://issues.apache.org/jira/browse/OAK-7390
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: query
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>            Priority: Major
>             Fix For: 1.12
>
>
> For queries with many union conditions, the "fast" getSize method can actually be slower
than iterating over the result. 
> The reason is, the number of index calls grows exponential with regards to number of
subqueries: (3x + x^2) / 2, where x is the number of subqueries. For this to have a measurable
affect, the number of subqueries needs to be large (more than 100), and the index needs to
be slow.



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