# Functions
Unmarshal to unmarshal an aggregation object.
UnmarshalAggObject unmarshal the input to the aggregation.
# Structs
AccumulatorFactory to return the object of the accumulator type.
AccumulatorOp is a type of aggregation that can also be use in the group by to group values into subsets.
ArithmeticFactory to return the object of the arithmeticOp type.
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# Interfaces
Aggregation operators either can pass a single expression or an array of expression.