@Override
  public boolean isTagsPresent() {
    for (ImmutableSegment s : segments) {
      if (s.isTagsPresent()) return true;
    }
    return false;
  }
Creates the scanner for the given read point
@return a scanner for the given read point
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.java