SimpleTypedAggregateExpression
SimpleTypedAggregateExpression is…FIXME
SimpleTypedAggregateExpression is created when…FIXME
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Creating SimpleTypedAggregateExpression Instance
SimpleTypedAggregateExpression takes the following when created:
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Optional input deserializer expression 
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Optional schema for the input 
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Buffer serializer (as a collection of named expressions) 
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Buffer deserializer expression 
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Output serializer (as a collection of expressions)