mysql 5.6.35 ST_Contains返回null

Question

SELECT 
  ST_Contains (
    GEOMFROMTEXT(
      'POLYGON(18.4560233 73.8691627, 18.456333 73.869013, 18.456363 73.869404, 18.456200, 73.869383,18.4560233 73.8691627)'
    ),
    GEOMFROMTEXT('POINT(18.456266, 73.869210)')
  ) 
FROM
  DUAL 

Answer 1

选择     ST_CONTAINS
        （              GEOMFROMTEXT（＆＃39; POLYGON（（18.4560233 73.8691627,18.456333 73.869013,18.456363 73.869404,18.456200 73.869383,18.4560233 73.8691627））＃）;       GEOMFROMTEXT（＆＃39; POINT（18.456266 73.869210）＆＃39;））

FROM DUAL