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Faceting with LuceneBlock Join Query
Agenda
1. Why we need special faceting for Block Join queries?
2. Proposed Block Join facet component.
Introducing myself
Oleg Savrasov, PhD
A programmer
Working for Grid Dynamics (griddynamics.com)
Work and live in Saint-Petersburg, Russia
Online shopping
Jerrica is looking for a dress
Huge amount of dresses
Facet filters help
Facet filters
Reduced amount
Tasks to be solved
● Performant Search
● Facet calculation/filtering
FacetComponent ?
Product has many SKU
Aggregated facet counts
Facets should count products, not SKU.
Expected facets:
COLOR Blue : 1 Red : 1SIZE S : 1 M : 1
Flat documents don’t help
False positive match for
+COLOR:Blue +SIZE:M
Separate SKU documents
q = *:*facet.field = COLORfacet.field = SIZE
COLOR Blue : 1 Red : 2SIZE S : 2 M : 1
Wrong numbers!
There is only one product
Search products only
q = *:*fq = scope:productfacet.field = COLORfacet.field = SIZE
COLOR : 0
SIZE : 0
No such fields in product documents
Aggregated facet counts
Facets should count products, not SKU.
Expected facets:
COLOR Blue : 1 Red : 1SIZE S : 1 M : 1
Solr Block Join Support (since Lucene 3.4.0)
Gre
en
Blu
e
Yel
low
Yel
low
Blu
e
Gre
en
Pro
duct
Gre
en
Yel
low
Pro
duct
Gre
en
Blu
e
Yel
low
Yel
low
Pro
duct
docId
1 1 1
Query: {!parent which="scope:product"}COLOR:Blue
1 1
scope:product
COLOR:Blue
ToParentQuery 1 1
Child docs Parent doc
Block1
SOLR-5743 Faceting with Block Join support
● Create BlockJoinFacetComponent
● Only DocValues fields are supported
● Facet counts should correspond to amount of parent documents
● ToParentQuery is expected
Faceting over DocSet slicesG
reen
Blu
e
Yel
low
Yel
low
Blu
e
Gre
en
Pro
duct
Gre
en
Yel
low
Pro
duct
Gre
en
Blu
e
Yel
low
Yel
low
Pro
duct
docId
10 1 0 0 1 0DocSet Slice
DocSet Slice counts
COLOR Blue : 2
Aggregated counts
COLOR Blue : +1
Block Join Facet Component
BlockJoinFacetCollector
Facets counting
It works!
q = {!parent which="scope:product"}COLOR:Blue
child.facet.field = SIZE
<response> ... <lst name="facet_counts">
<lst name="facet_fields"> <lst name="SIZE"> <int name="S">14</int> <int name="L">22</int> <int name="XL">17</int> </lst>
</lst> </lst></response>
The dress is found
Further improvements
● Thorough profiling
● Performance improvements
● Algorithmic improvements
References
http://www.slideshare.net/MarkHarwood/proposal-for-nested-document-support-in-lucene
http://blog.mikemccandless.com/2012/01/searching-relational-content-with.html
http://blog.griddynamics.com/2013/09/solr-block-join-support.html
Big thanks!
Do you have any questions?
Please vote for SOLR-5743.
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