func (this *InitialProject) processTerms(item value.AnnotatedValue, context *Context) bool {
n := len(this.plan.Terms())
sv := value.NewScopeValue(make(map[string]interface{}, n), item)
pv := value.NewAnnotatedValue(sv)
pv.SetAnnotations(item)
p := value.NewValue(make(map[string]interface{}, n+32))
pv.SetAttachment("projection", p)
for _, term := range this.plan.Terms() {
if term.Result().Alias() != "" {
v, err := term.Result().Expression().Evaluate(item, context)
if err != nil {
context.Error(errors.NewEvaluationError(err, "projection"))
return false
}
p.SetField(term.Result().Alias(), v)
// Explicit aliases override data
if term.Result().As() != "" {
pv.SetField(term.Result().As(), v)
}
} else {
// Star
starval := item.GetValue()
if term.Result().Expression() != nil {
var err error
starval, err = term.Result().Expression().Evaluate(item, context)
if err != nil {
context.Error(errors.NewEvaluationError(err, "projection"))
return false
}
}
// Latest star overwrites previous star
switch sa := starval.Actual().(type) {
case map[string]interface{}:
for k, v := range sa {
p.SetField(k, v)
}
}
}
}
return this.sendItem(pv)
}
