ST_PointFromGeoHash(geohash_str, srid)

Returns a POINT value containing the decoded geohash value, given a
geohash string value. The X and Y coordinates of the point are the
longitude in the range [-180, 180] and the latitude in the range [-90,
90], respectively. The srid value is an unsigned 32-bit integer. The
result is NULL if any argument is NULL. An error occurs if any argument
is invalid.

The remarks in the description of ST_LatFromGeoHash() regarding the
maximum number of characters processed from the geohash_str argument
also apply to ST_PointFromGeoHash().

URL: http://dev.mysql.com/doc/refman/5.7/en/spatial-geohash-functions.html

