// N1QLTransform will use compile list of expression from N1QL's DDL
// statement and evaluate a document using them to return a secondary
// key as JSON object.
func N1QLTransform(document []byte, cExprs []interface{}) ([]byte, error) {
arrValue := make([]*dparval.Value, 0, len(cExprs))
for _, cExpr := range cExprs {
expr := cExpr.(ast.Expression)
// TODO: CBIDXT-133: needs to send nil secondary keys to indexer
key, err := expr.Evaluate(dparval.NewValueFromBytes(document))
if err != nil {
return nil, nil
}
arrValue = append(arrValue, key)
}
if len(arrValue) > 1 {
secKey := dparval.NewValue(make([]interface{}, len(cExprs)))
for i, key := range arrValue {
secKey.SetIndex(i, key)
}
return secKey.Bytes(), nil // [ seckey1, seckey2, ... ]
} else if len(arrValue) == 1 {
return arrValue[0].Bytes(), nil // seckey1
}
return nil, ErrorEmptyN1QLExpression
}
func (b *bucket) BulkFetch(ids []string) (map[string]*dparval.Value, query.Error) {
rv := make(map[string]*dparval.Value, 0)
bulkResponse, err := b.cbbucket.GetBulk(ids)
if err != nil {
return nil, query.NewError(err, "Error doing bulk get")
}
for k, v := range bulkResponse {
doc := dparval.NewValueFromBytes(v.Body)
meta_flags := (v.Extras[0]&0xff)<<24 | (v.Extras[1]&0xff)<<16 | (v.Extras[2]&0xff)<<8 | (v.Extras[3] & 0xff)
meta_type := "json"
if doc.Type() == dparval.NOT_JSON {
meta_type = "base64"
}
doc.SetAttachment("meta", map[string]interface{}{
"id": k,
"cas": float64(v.Cas),
"type": meta_type,
"flags": float64(meta_flags),
})
rv[k] = doc
}
return rv, nil
}
func fetch(path string) (item *dparval.Value, e query.Error) {
bytes, err := ioutil.ReadFile(path)
if err != nil {
if os.IsNotExist(err) {
// file doesn't exist should simply return nil,nil
return
}
return nil, query.NewError(err, "")
}
doc := dparval.NewValueFromBytes(bytes)
doc.SetAttachment("meta", map[string]interface{}{"id": documentPathToId(path)})
item = doc
return
}
func (this *Explain) Run(stopChannel misc.StopChannel) {
defer close(this.itemChannel)
defer close(this.supportChannel)
// this MUST be here so that it runs before the channels are closed
defer this.RecoverPanic()
this.downstreamStopChannel = stopChannel
clog.To(CHANNEL, "explain operator starting")
item := dparval.NewValue(map[string]interface{}{})
planBytes, err := json.Marshal(this.Plan)
if err != nil {
this.SendError(query.NewError(err, "error serializing plan to JSON"))
} else {
projection := dparval.NewValueFromBytes(planBytes)
item.SetAttachment("projection", projection)
this.SendItem(item)
}
clog.To(CHANNEL, "explain operator finished")
}