Gabriel Magno created SOLR-16646:
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Summary: 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
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=\{!knn
f%3Dfilm_vector
topK%3D10000}[0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0%2C0.0]&sort=%24similarity
desc
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