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From "Vikas Saurabh (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-6734) IndexPlan: add supportsPathRestrictions
Date Wed, 27 Sep 2017 14:44:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-6734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vikas Saurabh updated OAK-6734:
-------------------------------
    Sprint: L11

> IndexPlan: add supportsPathRestrictions
> ---------------------------------------
>
>                 Key: OAK-6734
>                 URL: https://issues.apache.org/jira/browse/OAK-6734
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: query
>            Reporter: Thomas Mueller
>            Assignee: Vikas Saurabh
>             Fix For: 1.8
>
>
> Some indexes support path restrictions (for example Lucene indexes, if configured to
do so). For such cases, the cost of using the index is at most the cost of traversing.
> There are two ways to solve this: (1) the index itself could (somehow) ask the counter
index about the estimated number of nodes for that path. (2) the query engine can do that
itself, so that the index doesn't need to implement this logic.
> Let's do approach (2), and add a method supportsPathRestrictions to the IndexPlan interface.
If it returns false (default), the behavior is the same as right now. If it returns true,
then the cost of the index is adjusted to the estimated number of nodes in this path.



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