[jira] [Assigned] (SOLR-16646) Create a new function query operator to verify if value is NaN (isnan)

["Kevin Risden (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-16646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kevin Risden reassigned SOLR-16646:
-----------------------------------

    Assignee: Kevin Risden

> 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
>            Assignee: Kevin Risden
>            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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