See: Description
| Class | Description | 
|---|---|
| CountFunction | A reduction function which either counts the number of values that the parameter expression contains,
 or the number of documents returned if no parameter is given. | 
| DocCountFunction | A reduction function which either counts the number of Solr Documents for which the parameter expression exists,
 or the number of documents returned if no parameter is given. | 
| MaxFunction | A reduction function which returns the maximum value of the given expression. | 
| MeanFunction | A reduction function which returns the mean of the values of the given expression. | 
| MeanFunction.SumData | |
| MedianFunction | A reduction function which returns the median value of the given expression. | 
| MinFunction | A reduction function which returns the minumum value of the given expression. | 
| MissingFunction | A reduction function which returns the number of documents for which the given expression does not exist. | 
| OrdinalFunction | A reduction function which returns the given ordinal of the sorted values of the given expression. | 
| PercentileFunction | A reduction function which returns the given percentile of the sorted values of the given expression. | 
| SumFunction | A reduction function which returns the sum of the values of the given expression. | 
| SumFunction.SumData | |
| UniqueFunction | A reduction function which returns the number of unique values of the given expression. | 
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