Aggregate Operators

Operator Class Convenience Method Description
Count GroupCount GroupByReader.count(String) The number of records in each group.
Sum GroupSum GroupByReader.sum(String, String) The sum of the argument in each group.
Avg GroupAverage GroupByReader.avg(String, String) The average of the argument in each group.
Max GroupMaximum GroupByReader.max(String, String) The maximum value in each group.
Min GroupMinimum GroupByReader.min(String, String) The minimum value in each group.
First GroupFirst GroupByReader.first(String, String) The first value seen in each group.
Last GroupLast GroupByReader.first(String, String) The last value seen in each group.

* all operators are in the package.

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