fixed stuff for ongoing transactions

Author: Harshil goel

posting/lists.go

@@ -340,12 +340,32 @@ func (lc *LocalCache) GetSinglePosting(key []byte) (*pb.PostingList, error) {
 		return nil
 	}
 
+	getList := func() *List {
+		lc.RLock()
+		defer lc.RUnlock()
+
+		return lc.plists[string(key)]
+	}
+
+	getPostingFromList := func() *pb.PostingList {
+		l := getList()
+		if l != nil {
+			return l.mutationMap[lc.startTs]
+		}
+		return nil
+	}
+
 	getPostings := func() (*pb.PostingList, error) {
 		pl := getDeltas()
 		if pl != nil {
 			return pl, nil
 		}
 
+		pl = getPostingFromList()
+		if pl != nil {
+			return pl, nil
+		}
+
 		pl = &pb.PostingList{}
 		txn := pstore.NewTransactionAt(lc.startTs, false)
 		item, err := txn.Get(key)