Houston Putman created LUCENE-6705:
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Summary: 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
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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