[jira] [Created] (SOLR-11283) Refactor all Stream Evaluators in solrj.io.eval to simplify them

["Dennis Gove (JIRA)" <ji...@apache.org>]

Dennis Gove created SOLR-11283:
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             Summary: Refactor all Stream Evaluators in solrj.io.eval to simplify them
                 Key: SOLR-11283
                 URL: https://issues.apache.org/jira/browse/SOLR-11283
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Dennis Gove
            Assignee: Dennis Gove


As Stream Evaluators have been evolving we are seeing a need to better handle differing types of data within evaluators. For example, allowing some to evaluate over individual values or arrays of values, like
{code}
sin(a)
sin(a,b,c,d)
sin([a,b,c,d])
{code}

The current structure of Evaluators makes this difficult and repetitive work. 

Also, the hierarchy of classes behind evaluators can be confusing for developers creating new evaluators. For example, when to use a ComplexEvaluator vs a BooleanEvaluator.

A full refactoring of these classes will greatly enhance the usability and future evolution of evaluators.



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