func (this *IntersectScan) processKey(item value.AnnotatedValue, context *Context) bool {
m := item.GetAttachment("meta")
meta, ok := m.(map[string]interface{})
if !ok {
context.Error(errors.NewInvalidValueError(
fmt.Sprintf("Missing or invalid meta %v of type %T.", m, m)))
return false
}
k := meta["id"]
key, ok := k.(string)
if !ok {
context.Error(errors.NewInvalidValueError(
fmt.Sprintf("Missing or invalid primary key %v of type %T.", k, k)))
return false
}
count := this.counts[key]
this.counts[key] = count + 1
if count+1 == len(this.scans) {
delete(this.values, key)
return this.sendItem(item)
}
if count == 0 {
this.values[key] = item
}
return true
}
func (this *Distinct) processItem(item value.AnnotatedValue, context *Context) bool {
p := item.GetAttachment("projection")
if p == nil {
p = item
}
this.set.Put(p.(value.Value), item)
return true
}
func (this *FinalProject) processItem(item value.AnnotatedValue, context *Context) bool {
pv := item.GetAttachment("projection")
if pv != nil {
v := pv.(value.Value)
return this.sendItem(value.NewAnnotatedValue(v))
}
return this.sendItem(item)
}
func (this *Unset) processItem(item value.AnnotatedValue, context *Context) bool {
clone, ok := item.GetAttachment("clone").(value.AnnotatedValue)
if !ok {
context.Error(errors.NewInvalidValueError(
fmt.Sprintf("Invalid UPDATE clone of type %T.", clone)))
return false
}
for _, t := range this.plan.Node().Terms() {
unsetPath(t, clone, context)
}
return this.sendItem(item)
}
func (this *Order) lessThan(v1 value.AnnotatedValue, v2 value.AnnotatedValue) bool {
var ev1, ev2 value.Value
var c int
var e error
for i, term := range this.plan.Terms() {
s := this.terms[i]
sv1 := v1.GetAttachment(s)
switch sv1 := sv1.(type) {
case value.Value:
ev1 = sv1
default:
ev1, e = term.Expression().Evaluate(v1, this.context)
if e != nil {
this.context.Error(errors.NewEvaluationError(e, "ORDER BY"))
return false
}
v1.SetAttachment(s, ev1)
}
sv2 := v2.GetAttachment(s)
switch sv2 := sv2.(type) {
case value.Value:
ev2 = sv2
default:
ev2, e = term.Expression().Evaluate(v2, this.context)
if e != nil {
this.context.Error(errors.NewEvaluationError(e, "ORDER BY"))
return false
}
v2.SetAttachment(s, ev2)
}
c = ev1.Collate(ev2)
if c == 0 {
continue
} else if term.Descending() {
return c > 0
} else {
return c < 0
}
}
return false
}
func (this *IntermediateGroup) processItem(item value.AnnotatedValue, context *Context) bool {
// Generate the group key
var gk string
if len(this.plan.Keys()) > 0 {
var e error
gk, e = groupKey(item, this.plan.Keys(), context)
if e != nil {
context.Fatal(errors.NewEvaluationError(e, "GROUP key"))
return false
}
}
// Get or seed the group value
gv := this.groups[gk]
if gv == nil {
gv = item
this.groups[gk] = gv
return true
}
// Cumulate aggregates
part, ok := item.GetAttachment("aggregates").(map[string]value.Value)
if !ok {
context.Fatal(errors.NewInvalidValueError(
fmt.Sprintf("Invalid partial aggregates %v of type %T", part, part)))
return false
}
cumulative := gv.GetAttachment("aggregates").(map[string]value.Value)
if !ok {
context.Fatal(errors.NewInvalidValueError(
fmt.Sprintf("Invalid cumulative aggregates %v of type %T", cumulative, cumulative)))
return false
}
for _, agg := range this.plan.Aggregates() {
a := agg.String()
v, e := agg.CumulateIntermediate(part[a], cumulative[a], context)
if e != nil {
context.Fatal(errors.NewGroupUpdateError(
e, "Error updating intermediate GROUP value."))
return false
}
cumulative[a] = v
}
return true
}
func (this *UnionScan) processKey(item value.AnnotatedValue, context *Context) bool {
m := item.GetAttachment("meta")
meta, ok := m.(map[string]interface{})
if !ok {
context.Error(errors.NewInvalidValueError(
fmt.Sprintf("Missing or invalid meta %v of type %T.", m, m)))
return false
}
k := meta["id"]
key, ok := k.(string)
if !ok {
context.Error(errors.NewInvalidValueError(
fmt.Sprintf("Missing or invalid primary key %v of type %T.", k, k)))
return false
}
if this.values[key] != nil {
return true
}
this.values[key] = item
return this.sendItem(item)
}
func (this *base) requireKey(item value.AnnotatedValue, context *Context) (string, bool) {
mv := item.GetAttachment("meta")
if mv == nil {
context.Error(errors.NewError(nil, "Unable to find meta."))
return "", false
}
meta := mv.(map[string]interface{})
key, ok := meta["id"]
if !ok {
context.Error(errors.NewError(nil, "Unable to find key."))
return "", false
}
act := value.NewValue(key).Actual()
switch act := act.(type) {
case string:
return act, true
default:
e := errors.NewError(nil, fmt.Sprintf("Unable to process non-string key %v of type %T.", act, act))
context.Error(e)
return "", false
}
}