code: public <T, U> U forStream(
              String fileName,
              Class<T> clazz,
              Function<? super Stream<T>, U> handleStream) {
          String sql = getTemplate(fileName, EMPTY_ARGS);
          PreparedStatementSetter pss = paramBuilder.byArgs(new Object[0]);
          RowMapper<T> mapper = mapperBuilder.mapper(clazz);
          return queryStreamWithOrdinalParams(sql, pss, mapper, handleStream);
      }
docs: Executes a query, passing the row objects to {@code handleStream} as a stream.
  
  <p>Example usage:</p>
  
  <pre>
  int totalSalary = sqlTemplate.forStream("/path/to/query.sql", Emp.class,
  (Stream&lt;Emp&gt; empStream) -&gt; empStream.mapToInt(Emp::getSalary).sum());
  </pre>
  
  @param fileName SQL specifier
  @param clazz the row object class
  @param handleStream  the function which is applied to the stream
  @param <T> the row object type
  @param <U> the result type
  @return the result of {@code handleStream}
  @throws org.springframework.dao.DataAccessException if there is any problem