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From "Vadim Kirilchuk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4768) Child Traversable To Parent Block Join Query
Date Mon, 11 Feb 2013 18:03:12 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575939#comment-13575939
] 

Vadim Kirilchuk commented on LUCENE-4768:
-----------------------------------------

Thanks for suggestions, Mark!

I know about the problems you mentioned and there are several solutions for them, however
it is topic for another discussion. I just wanted to show you, where i faced the problem related
to "block-join". 

Maybe it is not a problem at all (at least i solved it for myself), it seems that i need to
find more common case when you need to traverse childs manually..

Thanks again and let me think about such case. 
                
> Child Traversable To Parent Block Join Query
> --------------------------------------------
>
>                 Key: LUCENE-4768
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4768
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/query/scoring
>         Environment: trunk
> git rev-parse HEAD
> 5cc88eaa41eb66236a0d4203cc81f1eed97c9a41
>            Reporter: Vadim Kirilchuk
>         Attachments: LUCENE-4768-draft.patch
>
>
> Hi everyone!
> Let me describe what i am trying to do:
> I have hierarchical documents ('car model' as parent, 'trim' as child) and use block
join queries to retrieve them. However, i am not happy with current behavior of ToParentBlockJoinQuery
which goes through all parent childs during nextDoc call (accumulating scores and freqs).
> Consider the following example, you have a query with a custom post condition on top
of such bjq: and during post condition you traverse scorers tree (doc-at-time) and want to
manually push child scorers of bjq one by one until condition passes or current parent have
no more childs.
> I am attaching the patch with query(and some tests) similar to ToParentBlockJoin but
with an ability to traverse childs. (i have to do weird instance of check and cast inside
my code) This is a draft only and i will be glad to hear if someone need it or to hear how
we can improve it. 
> P.s i believe that proposed query is more generic (low level) than ToParentBJQ and ToParentBJQ
can be extended from it and call nextChild() internally during nextDoc().
> Also, i think that the problem of traversing hierarchical documents is more complex as
lucene have only nextDoc API. What do you think about making api more hierarchy aware? One
level document is a special case of multi level document but not vice versa. WDYT?
> Thanks in advance.

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