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https://issues.apache.org/jira/browse/SOLR-13776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein resolved SOLR-13776.
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Resolution: Fixed
This is supported as shown by the docs:
https://solr.apache.org/guide/8_11/numerical-analysis.html#the-second-derivative-acceleration
> Allow derivatives to be computed for derivatives
> ------------------------------------------------
>
> Key: SOLR-13776
> URL: https://issues.apache.org/jira/browse/SOLR-13776
> Project: Solr
> Issue Type: Improvement
> Components: streaming expressions
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Minor
>
> The *derivative* Stream Evaluator operates over functions (spline, lerp,
> akima, loess, polyfit, oscillate etc...), but does not work with the function
> returned by the derivative function itself. This means a spline needs to be
> wrapped around the derivative to take a second derivative. This ticket will
> allow the derivative function to be applied directly to output of the
> derivative function, by internally wrapping a spline around derivative
> function that was passed in.
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