Merge pull request #1 from mrproliu/support-drop-with-empty

Support drop segment with to empty

Author: hanahmily

load.go

@@ -138,6 +138,9 @@ func (s *Segment) loadFields() error {
 
 // loadStoredFieldChunk load storedField chunk offsets
 func (s *Segment) loadStoredFieldChunk() error {
+	if s.footer.storedIndexOffset == 0 {
+		return nil
+	}
 	// read chunk num
 	chunkOffsetPos := int(s.footer.storedIndexOffset - uint64(sizeOfUint32))
 	chunkData, err := s.data.Read(chunkOffsetPos, chunkOffsetPos+sizeOfUint32)

merge.go

@@ -153,6 +153,7 @@ func mergeToWriter(segments []*Segment, drops []*roaring.Bitmap,
 		}
 	} else {
 		dictLocs = make([]uint64, len(fieldsInv))
+		newDocNums = make([][]uint64, len(segments))
 	}
 
 	if docTimeMin == math.MaxInt64 {