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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-388) Add NodeType Index
Date Mon, 05 Nov 2012 10:05:12 GMT

    [ https://issues.apache.org/jira/browse/OAK-388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490543#comment-13490543
] 

Jukka Zitting commented on OAK-388:
-----------------------------------

bq. an index is free to ignore that

Yes, that's a valid alternative. My point is that if we in any case need to do the work of
evaluating type inheritance at least in one index implementation, it would be better to do
it just once in the QueryEngine - both in terms of performance and of avoiding duplicate code.

Note that the node type resolution is probably in any case needed (it's currently not done
since the cost estimates are so basic) for an index implementation that understands node types
to be able to give a reasonable cost estimate, so the idea of avoiding type inheritance entirely
for simple queries like the one you mentioned.

bq. transforming the node type restriction into simple property constraints

+1 though as mentioned this will require extending the Filter mechanism with support for OR
clauses. I wonder if we should rather just replace Filter with a Constraint from the abstract
query tree.
                
> Add NodeType Index
> ------------------
>
>                 Key: OAK-388
>                 URL: https://issues.apache.org/jira/browse/OAK-388
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>            Reporter: Alex Parvulescu
>            Assignee: Marcel Reutegger
>             Fix For: 0.6
>
>         Attachments: oak-core-property-index.patch
>
>
> I'm proposing a new property index for node types.

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