[jira] [Created] (SOLR-7761) Adding functionality to FunctionValues to support filling external MutableValues and having multiple ValueFillers.

["Houston Putman (JIRA)" <ji...@apache.org>]

Houston Putman created SOLR-7761:
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             Summary: Adding functionality to FunctionValues to support filling external MutableValues and having multiple ValueFillers.
                 Key: SOLR-7761
                 URL: https://issues.apache.org/jira/browse/SOLR-7761
             Project: Solr
          Issue Type: Improvement
    Affects Versions: 4.10.4
            Reporter: Houston Putman
            Priority: Minor


This is mostly a Lucene change that affects some Solr code, so I made the issue here. If the issue needs to also be made in Lucene, that can be done. 

Overall this adds the functionality to FunctionValues so that they can fill a given MutableValue. This allows functions that have an input and output of the same type, like IF, to have generic ValueSources without the need for individual sources for every type. This change also gives the ability to make ValueFillers for given MutableValues. Therefore MutableValues don't need to be created for every ValueFiller and can be re-used. 



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