func (udc *UpsideDownCouch) loadSchema(kvreader store.KVReader) (err error) {
keyPrefix := []byte{'f'}
it := kvreader.Iterator(keyPrefix)
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
it.Seek(keyPrefix)
key, val, valid := it.Current()
for valid {
// stop when
if !bytes.HasPrefix(key, keyPrefix) {
break
}
var fieldRow *FieldRow
fieldRow, err = NewFieldRowKV(key, val)
if err != nil {
return
}
udc.fieldIndexCache.AddExisting(fieldRow.name, fieldRow.index)
it.Next()
key, val, valid = it.Current()
}
keyPrefix = []byte{'v'}
val, err = kvreader.Get(keyPrefix)
if err != nil {
return
}
var vr *VersionRow
vr, err = NewVersionRowKV(keyPrefix, val)
if err != nil {
return
}
if vr.version != Version {
err = IncompatibleVersion
return
}
return
}
func (udc *UpsideDownCouch) backIndexRowForDoc(kvreader store.KVReader, docID string) (*BackIndexRow, error) {
// use a temporary row structure to build key
tempRow := &BackIndexRow{
doc: []byte(docID),
}
key := tempRow.Key()
value, err := kvreader.Get(key)
if err != nil {
return nil, err
}
if value == nil {
return nil, nil
}
backIndexRow, err := NewBackIndexRowKV(key, value)
if err != nil {
return nil, err
}
return backIndexRow, nil
}