Houston Putman closed LUCENE-6705.
    Resolution: Won't Do

> Adding functionality to FunctionValues to support filling external 
> MutableValues and having multiple ValueFillers.
> ------------------------------------------------------------------------------------------------------------------
>                 Key: LUCENE-6705
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6705
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 4.10
>            Reporter: Houston Putman
>            Priority: Minor
>         Attachments: LUCENE-6705.patch
> 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.
> Originally this change was made in order to increase performance by recycling 
> MutbaleValues. So that one could keep track of a MutableValue and fill it 
> without ever changing the reference.

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