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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 12:05:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575749#comment-13575749
] 

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

Right, ORs are about matches on same child doc. Agree that example miss this important thing.
I also agree that child query will skip non-matching childs, but it's worth to mention that
my query is full of ORs and it will hit many childrens.

What am i trying to optimize...it is not about speed:
My post constraint code have to traverse matched scorers tree and gather information about
current hit - i need to know field and text for each matched leaf scorer (i mean TermQuery).
Current ToParent BlockJoinScorer doesn't provide me with such information, to do so it have
to accumulate leaf scorers info internally during nextDoc for each matched child. But with
ChildTraversable query i am able to check child scorers directly when i got a match. I just
need more control over scorers. What do you think? 

And thanks for the detailed explanation, Mark!





                
> 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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