}

func (e *PrimaryTerm) evalNode(r Record, tableAlias string) (res *Value, err error) {
	switch {
	case e.Value != nil:
		return e.Value.evalNode(r)
	case e.JPathExpr != nil:
		return e.JPathExpr.evalNode(r, tableAlias)
	case e.ListExpr != nil:
		return e.ListExpr.evalNode(r, tableAlias)
	case e.SubExpression != nil:
		return e.SubExpression.evalNode(r, tableAlias)
	case e.FuncCall != nil:

// 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 != nil {
			return err
		}
		if expr.As != "" {
			output, err = output.Set(expr.As, v)
		} else {
			output, err = output.Set(fmt.Sprintf("_%d", i+1), v)
		}