code: public <T, U> U forStream(
              String fileName,
              Class<T> clazz,
              Object entity,
              Function<? super Stream<T>, U> handleStream) {
          String sql = getTemplate(fileName, entity);
          RowMapper<T> mapper = mapperBuilder.mapper(clazz);
          SQLExceptionTranslator excTranslator = jdbcTemplate.getExceptionTranslator();
          if (TypeUtils.isSimpleValueType(entity.getClass())) {
              PreparedStatementSetter pss = paramBuilder.byArgs(entity);
              return queryStreamWithOrdinalParams(sql, pss, mapper, handleStream);
          } else {
              SqlParameterSource sps = paramBuilder.byBean(entity);
              return queryStreamWithNamedParams(sql, sps, mapper, handleStream);
          }
      }
docs: Executes a query, passing the row objects to {@code handleStream} as a stream.
  
  <p>{@code entity} is used as the single parameter if it is a simple value,
  or as the container of the named parameters if it is a bean.</p>
  
  <p>Example usage with a simple value parameter:</p>
  
  <pre>
  int totalSalary = sqlTemplate.forStream("/path/to/query.sql", Emp.class, "SALESMAN",
  empStream -&gt; empStream.mapToInt(Emp::getSalary).sum());
  </pre>
  
  <p>Example usage with a bean parameter:</p>
  
  <pre>
  emp.setDeptno(30);
  emp.setJob("SALESMAN");
  int totalSalary = sqlTemplate.forStream("/path/to/query.sql", Emp.class, emp,
  empStream -&gt; empStream.mapToInt(Emp::getSalary).sum());
  </pre>
  
  @param fileName parameterized SQL specifier
  @param clazz the result object class
  @param entity the single parameter, or the container of the named parameters
  @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