Returns the string form of this ExprAggregate.
The string form of this ExprAggregate.
The ExprAggregate format is:
CopyC#
where FUNCTION is an aggregate function name.
FUNCTION(<i>subexpression</i>)
The format for an ExprAggregate with a filter is:
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where filter is the filter added by the Filter setting property.
FUNCTION(<i>subexpression</i>) WHERE <i>filter</i>