public byte[] getTableName() {
    setTableName(org.apache.thrift.TBaseHelper.rightSize(tableName));
    return tableName == null ? null : tableName.array();
  }
Returns true if field regionId is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/THRegionInfo.java