func (this *builder) VisitKeyspaceTerm(node *algebra.KeyspaceTerm) (interface{}, error) {
node.SetDefaultNamespace(this.namespace)
keyspace, err := this.getTermKeyspace(node)
if err != nil {
return nil, err
}
if this.subquery && this.correlated && node.Keys() == nil {
return nil, errors.NewSubqueryMissingKeysError(node.Keyspace())
}
scan, err := this.selectScan(keyspace, node, this.limit)
if err != nil {
return nil, err
}
this.children = append(this.children, scan)
if this.coveringScan == nil {
fetch := plan.NewFetch(keyspace, node)
this.subChildren = append(this.subChildren, fetch)
}
return nil, nil
}
func (this *builder) beginMutate(keyspace datastore.Keyspace, ksref *algebra.KeyspaceRef,
keys expression.Expression, indexes algebra.IndexRefs, limit expression.Expression, isDelete bool) error {
ksref.SetDefaultNamespace(this.namespace)
term := algebra.NewKeyspaceTerm(ksref.Namespace(), ksref.Keyspace(), nil, ksref.As(), keys, indexes)
this.children = make([]plan.Operator, 0, 8)
this.subChildren = make([]plan.Operator, 0, 8)
if this.where != nil {
limit = nil
}
scan, err := this.selectScan(keyspace, term, limit)
if err != nil {
return err
}
this.children = append(this.children, scan)
if this.coveringScan != nil {
coverer := expression.NewCoverer(this.coveringScan.Covers())
err = this.cover.MapExpressions(coverer)
if err != nil {
return err
}
if this.where != nil {
this.where, err = coverer.Map(this.where)
if err != nil {
return err
}
}
} else {
var fetch plan.Operator
if isDelete && this.where == nil && isKeyScan(scan) {
fetch = plan.NewDummyFetch(keyspace, term)
} else {
fetch = plan.NewFetch(keyspace, term)
}
this.subChildren = append(this.subChildren, fetch)
}
if this.where != nil {
this.subChildren = append(this.subChildren, plan.NewFilter(this.where))
}
return nil
}