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https://issues.apache.org/jira/browse/SOLR-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein resolved SOLR-11609.
-----------------------------------
    Fix Version/s:     (was: 9.0)
                       (was: 8.1)
       Resolution: Not A Problem

TIme series random walks are already supported:

https://solr.apache.org/guide/8_11/simulations.html#random-walk

> Add randomWalk Stream Evaluator to support time series simulations
> ------------------------------------------------------------------
>
>                 Key: SOLR-11609
>                 URL: https://issues.apache.org/jira/browse/SOLR-11609
>             Project: Solr
>          Issue Type: New Feature
>          Components: streaming expressions
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>            Priority: Major
>
> Now that we have *Monte Carlo* simulations and *Markov Chain* support it 
> would be useful to add a randomWalk function to support time series 
> simulations. The randomWalk function will utilize the probability 
> distribution framework and soon to be committed time series differencing 
> function SOLR-11571.



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