public boolean containsColumn(byte[] family, byte[] qualifier) {
    Cell kv = getColumnLatestCell(family, qualifier);
    return kv != null;
  }
Checks for existence of a value for the specified column (empty or not).
@param family    family name
@param qualifier column qualifier
@return true if at least one value exists in the result, false if not
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Result.java