create table bug47777(c2 linestring not null, primary key (c2(1))) engine=innodb;
insert into bug47777 values (geomfromtext('linestring(1 2,3 4,5 6,7 8,9 10)'));
select count(*) from bug47777 where c2 =geomfromtext('linestring(1 2,3 4,5 6,7 8,9 10)');
count(*)
1
update bug47777 set c2=GeomFromText('POINT(1 1)');
select count(*) from bug47777 where c2 =geomfromtext('linestring(1 2,3 4,5 6,7 8,9 10)');
count(*)
0
select count(*) from bug47777 where c2 = GeomFromText('POINT(1 1)');
count(*)
1
drop table bug47777;