baremaps-postgres/src/main/java/org/apache/baremaps/postgres/openstreetmap/CoordinateMap.java [146:154]:
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  protected Iterator<Long> keyIterator() {
    try (Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(selectKeys)) {
      ResultSet result = statement.executeQuery();
      return new ResultSetIterator<>(result, this::key);
    } catch (SQLException e) {
      throw new DataCollectionException(e);
    }
  }
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baremaps-postgres/src/main/java/org/apache/baremaps/postgres/openstreetmap/ReferenceMap.java [192:200]:
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  protected Iterator<Long> keyIterator() {
    try (Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(selectKeys)) {
      ResultSet result = statement.executeQuery();
      return new ResultSetIterator<>(result, this::key);
    } catch (SQLException e) {
      throw new DataCollectionException(e);
    }
  }
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