Пример #1
0
func NewOrderWithLimit(order *algebra.Order, offset *Offset, limit *Limit) *Order {
	return &Order{
		terms:  order.Terms(),
		offset: offset,
		limit:  limit,
	}
}
Пример #2
0
func NewOrder(order *algebra.Order) *Order {
	return &Order{
		terms:  order.Terms(),
		offset: nil,
		limit:  nil,
	}
}
Пример #3
0
func allAggregates(node *algebra.Subselect, order *algebra.Order) (map[string]algebra.Aggregate, error) {
	aggs := make(map[string]algebra.Aggregate)

	if node.Let() != nil {
		for _, binding := range node.Let() {
			collectAggregates(aggs, binding.Expression())
			if len(aggs) > 0 {
				return nil, fmt.Errorf("Aggregates not allowed in LET.")
			}
		}
	}

	if node.Where() != nil {
		collectAggregates(aggs, node.Where())
		if len(aggs) > 0 {
			return nil, fmt.Errorf("Aggregates not allowed in WHERE.")
		}
	}

	group := node.Group()
	if group != nil {
		letting := group.Letting()
		for _, binding := range letting {
			collectAggregates(aggs, binding.Expression())
		}

		having := group.Having()
		if having != nil {
			collectAggregates(aggs, having)
		}
	}

	projection := node.Projection()
	if projection != nil {
		for _, term := range projection.Terms() {
			if term.Expression() != nil {
				collectAggregates(aggs, term.Expression())
			}
		}
	}

	if order != nil {
		allow := len(aggs) > 0

		for _, term := range order.Terms() {
			if term.Expression() != nil {
				collectAggregates(aggs, term.Expression())
			}
		}

		if !allow && len(aggs) > 0 {
			return nil, fmt.Errorf("Aggregates not available for this ORDER BY.")
		}
	}

	return aggs, nil
}
Пример #4
0
func NewOrder(order *algebra.Order) *Order {
	return &Order{
		terms: order.Terms(),
	}
}