为什么这个空间查询返回空?

Why is this spatial query returning empty?

使用下面的简单 table,我正在尝试 select 给定 POLYGON 中的 'latlng POINT'。但是 return 总是空的,我错过了什么?

CREATE TABLE mypoi (
   id int not null auto_increment,
  latlng POINT not null,
  primary key(id)
)ENGINE=MyISM;

INSERT INTO mypoi VALUES
(1 ,  POINT( 39.274, -94.4233  )),
(2 , POINT( 39.5, -94.3483  ));

SELECT id, x(latlng), y(latlng)
FROM mypoi
WHERE MBRContains(GeomFromText('POLYGON((39.48025, -94.73566 , 39.48025, -94.09021 , 39.09122, -94.09021 , 39.09122, -94.73566))'),latlng);

WKT 多边形通过在点序列的末尾包含原始点来闭合。他们还用逗号分隔每个点(即 x1 y1, x2 y2, ..., x1 y1)。多边形文本中存在一些格式问题。

SELECT id, x(latlng), y(latlng)
FROM mypoi
WHERE MBRContains(GeomFromText('POLYGON((39.48025 -94.73566, 39.48025 -94.09021, 39.09122 -94.09021, 39.09122 -94.73566, 39.48025 -94.73566))'),latlng);