Creates new AggregationExpression that evaluates an expression and returns the value of the expression if
the expression evaluates to a non-null value.
Creates new AggregationExpression that evaluates an expression and returns the value of the expression if
the expression evaluates to a non-null value.
Creates new AggregationExpression that evaluates an expression and returns the value of the expression if
the expression evaluates to a non-null value. If the expression evaluates to a null value, including
instances of undefined values or missing fields, returns the value of the replacement expression.
Creates new AggregationExpression that evaluates an expression and returns the value of the expression if
the expression evaluates to a non-null value. If the expression evaluates to a null value, including
instances of undefined values or missing fields, returns the value of the replacement expression.