Query blending


Query blending generates and runs multiple variants of a query which are then blended into a single result set. Query blending can be performed based on a number of sources as defined in the -qsup query processor option. This file defines the blending rules to be applied.

Query blending sources

Query blending sources are configured by setting the -qsup query processor option.

A weighting (ranging from 0 to 1) is also defined when configuring the query blending sources.

Source qsup option Description

Spelling suggestions


Blend with suggestions returned from the spelling suggestion system

US/UK spelling differences


Blend with US/UK spelling variants (eg. authorise and authorize)



Blend with user-defined synonyms as defined in the blending.cfg.

Word decompounding


(Experimental) Blend with decompounded word forms (mostly for German language sites)



Synonyms query blending source

A blending.cfg can be created within a profile folder and used for the synonyms (SYNS) blending source.

Presenting a message in the search interface

When using a Freemarker template the <@fb.CheckBlending> macro can be used to provide information to the user that blending has occurred. This is included in the default template:

<#if (response.resultPacket.QSups)!?size gt 0>
	<div class="alert alert-info">
		<@fb.CheckBlending linkText="Search for <em>"+question.originalQuery+"</em> instead." tag="strong" />

Data model

Supplemental queries as generated by query blending are returned in the data model within the response.resultPacket.QSups element.

See also

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