[jira] [Created] (SOLR-5388) Combine def function with "multi" functions (max, min, sum, product)

["Andrey Kudryavtsev (JIRA)" <ji...@apache.org>]

Andrey Kudryavtsev created SOLR-5388:
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             Summary: Combine def function with "multi" functions (max, min, sum, product)
                 Key: SOLR-5388
                 URL: https://issues.apache.org/jira/browse/SOLR-5388
             Project: Solr
          Issue Type: New Feature
            Reporter: Andrey Kudryavtsev
            Priority: Minor
             Fix For: 5.0


Ability for expressions like _def(min(field1,..,fieldN), defValue)_  return _defValue_ if document doesn't have value for any of this fields. 
Implement exists(int doc) method for FunctionValues created in MultiFloatFunction. Extract method to get ability other MultiFloatFunction implementation to override it. 



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