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From Christoph Kaser <lucene_l...@iconparc.de>
Subject Re: ToParentBlockJoinQuery$BlockJoinWeight cannot explain match on parent document
Date Tue, 29 May 2012 08:40:03 GMT
Hi Martijn,

thank you for your response.

I created the following issue:
https://issues.apache.org/jira/browse/LUCENE-4082

Christoph

Am 25.05.2012 16:25, schrieb Martijn v Groningen:
> Hi Christoph,
>
> You can open an issue for this. I think we can use the child score as
> an explanation of why a parent doc is scored the way it is.
>
> Martijn
>
> On 25 May 2012 13:20, Christoph Kaser<lucene_list@iconparc.de>  wrote:
>> Hello all,
>>
>> I try to calculate score explanations for a query that contains a
>> ToParentBlockJoinQuery and get the following exception:
>>
>> java.lang.UnsupportedOperationException:
>> org.apache.lucene.search.join.ToParentBlockJoinQuery$BlockJoinWeight cannot
>> explain match on parent document
>> at
>> org.apache.lucene.search.join.ToParentBlockJoinQuery$BlockJoinWeight.explain(ToParentBlockJoinQuery.java:222)
>> at
>> org.apache.lucene.search.BooleanQuery$BooleanWeight.explain(BooleanQuery.java:236)
>>
>> I can understand that the ToParentBlockJoinQuery cannot explain the scores
>> of this document's children, but would it be possible not to throw an
>> exception but to simply output the score this document got from its
>> children? This would allow me to analyze the score obtained from other parts
>> of the complete query, and if needed, I could still get an explanation on
>> the childquery itself with a specific child id.
>>
>> Should I open an issue for this, or is it impossible to output any kind of
>> explanation (even a dummy explanation) in BlockJoinWeight?
>>
>> Regards,
>> Christoph
>>
>>
>

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