Adding boost/weight to fields

[AliFlux]

Hi,

Is there a way to add custom weight score to a specific field in tantivy-py. For example if our schema has both title and description fields. And we want the item that matches title to prioritize in the list, we can add weight to title

In whoosh, we can achieve this via field_boost:

title = whoosh.fields.TEXT(stored=True, field_boost=5.0)
description = whoosh.fields.TEXT(stored=True)

Tantivy natively supports boosting:
https://github.com/quickwit-oss/tantivy/blob/db1836691ef9b4f963070bfd9ef13c6d44d2a074/src/query/query_parser/query_parser.rs#L164
https://docs.rs/tantivy/0.16.0/tantivy/query/struct.QueryParser.html#method.set_field_boost

[VsevolodZakharov]

At least
index.parse_query("title:t^2 OR content:i^3")
gives repr
Query(BooleanQuery { subqueries: [(Should, Boost(query=TermQuery(Term(field=1,bytes=[116])), boost=2)), (Should, Boost(query=TermQuery(Term(field=2,bytes=[105])), boost=3))] })

But construction queries from Query classes is missing in tantivy-py. That wokrs fine in Whoosh. Otherwise parse_query should support fuzzy search, wildcards etc.

[AliFlux]

@VsevolodZakharov thanks for the reply.
Is document based boosting available in tantivy-py? Something like _boost in whoosh

[VsevolodZakharov]

@AliFlux AFAIK No, it is not available.

[fulmicoton]

It exists in tantivy:
https://docs.rs/tantivy/latest/tantivy/query/struct.QueryParser.html#method.set_field_boost

Someone just needs to plug it in tantivy-py