func (e *SelectStatement) IsAggregated() bool {
	return e.selectQProp.isAggregation
}

// AggregateResult - returns the aggregated result after all input
// records have been processed. Applies only to aggregation queries.
func (e *SelectStatement) AggregateResult(output Record) error {
	for i, expr := range e.selectAST.Expression.Expressions {
		v, err := expr.evalNode(nil, e.tableAlias)

			if err != io.EOF {
				break
			}

			if s3Select.statement.IsAggregated() {
				outputRecord := s3Select.outputRecord()
				if err = s3Select.statement.AggregateResult(outputRecord); err != nil {
					break
				}
				outputQueue = append(outputQueue, outputRecord)
			}

			if !sendRecord() {
				break
			}