baremaps-core/src/main/java/org/apache/baremaps/openstreetmap/postgres/PostgresCoordinateMap.java [119:127]:
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  protected Iterator<Long> keyIterator() {
    try (Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(SELECT_KEYS)) {
      ResultSet result = statement.executeQuery();
      return new PostgresIterator<>(result, this::key);
    } catch (SQLException e) {
      throw new DataCollectionException(e);
    }
  }
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baremaps-core/src/main/java/org/apache/baremaps/openstreetmap/postgres/PostgresReferenceMap.java [169:177]:
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  protected Iterator<Long> keyIterator() {
    try (Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(SELECT_KEYS)) {
      ResultSet result = statement.executeQuery();
      return new PostgresIterator<>(result, this::key);
    } catch (SQLException e) {
      throw new DataCollectionException(e);
    }
  }
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