public static boolean matchingTags(final ExtendedCell left, final ExtendedCell right) {
    return matchingTags(left, right, left.getTagsLength(), right.getTagsLength());
  }
Finds if the start of the qualifier part of the Cell matches <code>buf</code>
@param left       the cell with which we need to match the qualifier
@param startsWith the serialized keyvalue format byte[]
@return true if the qualifier have same staring characters, false otherwise
hbase-common/src/main/java/org/apache/hadoop/hbase/PrivateCellUtil.java