[SOLR-12238] Synonym Query Style Boost By Payload

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.2
• Fix Version/s: 8.5
• Component/s: query parsers
• Assignee: Alan Woodward
• Reporter: Alessandro Benedetti
• Created: 19/Apr/18 01:28
• Updated: 24/Mar/20 12:45
• Resolved: 24/Feb/20 10:48

Description

This improvement is built on top of the Synonym Query Style feature and brings the possibility of boosting synonym queries using the payload associated.

It introduces two new modalities for the Synonym Query Style :

PICK_BEST_BOOST_BY_PAYLOAD -> build a Disjunction query with the clauses boosted by payload

AS_DISTINCT_TERMS_BOOST_BY_PAYLOAD -> build a Boolean query with the clauses boosted by payload

This new synonym query styles will assume payloads are available so they must be used in conjunction with a token filter able to produce payloads.

An synonym.txt example could be :

1. Synonyms used by Payload Boost
   tiger => tiger|1.0, Big_Cat|0.8, Shere_Khan|0.9
   leopard => leopard, Big_Cat|0.8, Bagheera|0.9
   lion => lion|1.0, panthera leo|0.99, Simba|0.8
   snow_leopard => panthera uncia|0.99, snow leopard|1.0

A simple token filter to populate the payloads from such synonym.txt is :

<filter class="solr.DelimitedPayloadTokenFilterFactory" encoder="float" delimiter="|"/>

Issue Links

• is a child of: LUCENE-9171 Synonyms Boost by Payload
• relates to: SOLR-11662 Make overlapping query term scoring configurable per field type
• links to: GitHub Pull Request #357
• links to: GitHub Pull Request #357