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https://issues.apache.org/jira/browse/SOLR-16646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Risden updated SOLR-16646:
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Status: Patch Available (was: Open)
> Create a new function query operator to verify if value is NaN (isnan)
> ----------------------------------------------------------------------
>
> Key: SOLR-16646
> URL: https://issues.apache.org/jira/browse/SOLR-16646
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query
> Reporter: Gabriel Magno
> Priority: Minor
> Labels: FunctionQuery, operator
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> It would be useful to have a function query operator (e.g. `isnan`) to check
> rather a value is a float NaN (not a number).
> Examples of use cases:
> * Filtering out resulting documents having NaN in a certain field or
> expression
> * Setting values and expressions according to the condition of a
> field/expression being NaN (`if(isnan(value),0,1)`)
> * Replacing NaN by a default value (similar as a coalesce):
> `if(isnan(value),0,value)`
> This function/operator is particularly important considering that the cosine
> similarity calculated by KNN queries with Dense Vectors might return a NaN on
> the score depending on the vectors. For an example of a query returning NaN
> in the response (with the films example):
> http://localhost:8983/solr/films/select?fl=id%2C%24similarity&q=*%3A*&similarity=%7B!knn%20f%3Dfilm_vector%20topK%3D10000%7D[0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0]&sort=%24similarity%20desc
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