Lucene user discussion

Jayendra Patil | 25 Jul 2012 13:37

ToParentBlockJoinQuery - Faceting on Parent and Child Documents

Thanks Mike for the wonderful work on ToParentBlockJoinQuery.

We had a use case for Relational data search and are working with
ToParentBlockJoinQuery which works perfectly as mentioned  <at> 
http://blog.mikemccandless.com/2012/01/searching-relational-content-with.html

However, I couldn't find any examples on net or even in the JUnit
testcases to use Faceting on the Parent or the Child results.

Is it supported as yet ??? Can you provide us with any examples ??

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Martijn v Groningen | 3 Aug 2012 13:50

Re: ToParentBlockJoinQuery - Faceting on Parent and Child Documents

Hi Jayendra,

This isn't supported yet. You could implement this by creating a
custom Lucene collector.
This collector could count the unique hits inside a block of docs per
unique facet field value. The
unique facet values could be retrieved from Lucene's FieldCache or doc
values (if you can use Lucene 4.0
in your project).

In general I think this would be a cool addition!

Martijn

On 25 July 2012 13:37, Jayendra Patil <jayendra.patil.001 <at> gmail.com> wrote:
> Thanks Mike for the wonderful work on ToParentBlockJoinQuery.
>
> We had a use case for Relational data search and are working with
> ToParentBlockJoinQuery which works perfectly as mentioned  <at> 
> http://blog.mikemccandless.com/2012/01/searching-relational-content-with.html
>
> However, I couldn't find any examples on net or even in the JUnit
> testcases to use Faceting on the Parent or the Child results.
>
> Is it supported as yet ??? Can you provide us with any examples ??
>
> ---------------------------------------------------------------------
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Christoph Kaser | 3 Aug 2012 14:26

Re: ToParentBlockJoinQuery - Faceting on Parent and Child Documents

Hi Jayendra,

we use facetting and blockjoinqueries on lucene 3.6 like this:

- Create the FacetsCollector
- For facetting on Parent documents, use ToParentBlockJoinQuery, for 
facetting on children ToChildBlockJoinQuery (if needed, add additional 
query clauses using a Booleanquery)
- Use searcher.search(query,null,facetCollector)

This seems to work fine.

Best regards,
Christoph Kaser

Am 03.08.2012 13:50, schrieb Martijn v Groningen:
> Hi Jayendra,
>
> This isn't supported yet. You could implement this by creating a
> custom Lucene collector.
> This collector could count the unique hits inside a block of docs per
> unique facet field value. The
> unique facet values could be retrieved from Lucene's FieldCache or doc
> values (if you can use Lucene 4.0
> in your project).
>
> In general I think this would be a cool addition!
>
> Martijn
>

(Continue reading)