1create table bug47777(c2 linestring not null, primary key (c2(1))) engine=innodb;
2insert into bug47777 values (geomfromtext('linestring(1 2,3 4,5 6,7 8,9 10)'));
3select count(*) from bug47777 where c2 =geomfromtext('linestring(1 2,3 4,5 6,7 8,9 10)');
4count(*)
51
6update bug47777 set c2=GeomFromText('linestring(1 1)');
7select count(*) from bug47777 where c2 =geomfromtext('linestring(1 2,3 4,5 6,7 8,9 10)');
8count(*)
90
10select count(*) from bug47777 where c2 = GeomFromText('linestring(1 1)');
11count(*)
121
13drop table bug47777;
14