code: private void addJoinTable(List<Relation> relations)
      {
          for (Relation relation : relations)
          {
              if (relation.getType().equals(ForeignKey.MANY_TO_MANY) && relation.isRelatedViaJoinTable())
              {
                  String joinTableName = relation.getJoinTableMetadata().getJoinTableName();
                  String hTableName = HBaseUtils.getHTableName(databaseName, joinTableName);
                  HTableDescriptor tableDescriptor = new HTableDescriptor(TableName.valueOf(hTableName));
                  tableDescriptor.addFamily(new HColumnDescriptor(joinTableName));
                  createOrUpdateTable(hTableName, tableDescriptor);
              }
          }
      }
docs: Adds the join table.
  
  @param relations
  the relations