filterExpression |
An Apollo expression to keep some elements only. It is useful to process the
aggregation on a subpart of your input stream. |
keyExpression |
An Apollo expression extracting the key element for the Map. For example,
person.fullname . |
valueExpression |
An Apollo expression extracting the value element for the map. For example:
person.age . |
multiValued |
If true , the value element is a List . Default:
false . |