MDEV-21959 GIS error message doesn't show the wrong value, just the type.

Error message now shows the whole value.

mysql-test/r/gis.result

@@ -1689,7 +1689,7 @@ NULL
 #
 create table t1 (pt point);
 insert into t1 values(Geomfromtext('POLYGON((1 1, 2 2, 2 1, 1 1))'));
-ERROR 22007: Incorrect POINT value: 'POLYGON' for column `test`.`t1`.`pt` at row 1
+ERROR 22007: Incorrect POINT value: 'POLYGON((1 1,2 2,2 1,1 1))' for column `test`.`t1`.`pt` at row 1
 drop table t1;
 SELECT st_astext(ST_Buffer(ST_PolygonFromText('POLYGON((3 5, 2 4, 2 5, 3 5))'), -100));
 st_astext(ST_Buffer(ST_PolygonFromText('POLYGON((3 5, 2 4, 2 5, 3 5))'), -100))

mysql-test/suite/innodb/r/innodb-online-alter-gis.result

@@ -42,7 +42,7 @@ drop table t1;
 #
 CREATE TABLE t1 (a INT) ENGINE=InnoDB;
 ALTER TABLE t1 ADD COLUMN b LINESTRING DEFAULT POINT(1,1);
-ERROR 22007: Incorrect LINESTRING value: 'POINT' for column ``.``.`b` at row 1
+ERROR 22007: Incorrect LINESTRING value: 'POINT(1 1)' for column ``.``.`b` at row 1
 DESCRIBE t1;
 Field	Type	Null	Key	Default	Extra
 a	int(11)	YES		NULL	

mysql-test/suite/innodb_gis/r/1.result

@@ -1038,9 +1038,9 @@ SET @a=0x00000000030000000000000000000000000000000000144000000000000014400000000
 SET @a=ST_POLYFROMWKB(@a);
 create table t1(a polygon NOT NULL)engine=InnoDB;
 insert into t1 values (ST_geomfromtext("point(0 1)"));
-ERROR 22007: Incorrect POLYGON value: 'POINT' for column `test`.`t1`.`a` at row 1
+ERROR 22007: Incorrect POLYGON value: 'POINT(0 1)' for column `test`.`t1`.`a` at row 1
 insert into t1 values (ST_geomfromtext("point(1 0)"));
-ERROR 22007: Incorrect POLYGON value: 'POINT' for column `test`.`t1`.`a` at row 1
+ERROR 22007: Incorrect POLYGON value: 'POINT(1 0)' for column `test`.`t1`.`a` at row 1
 select * from (select polygon(t1.a) as p from t1 order by t1.a) d;
 p
 drop table t1;

mysql-test/suite/innodb_gis/r/gis.result

@@ -1034,9 +1034,9 @@ SET @a=0x00000000030000000000000000000000000000000000144000000000000014400000000
 SET @a=ST_POLYFROMWKB(@a);
 create table t1(a polygon NOT NULL)engine=innodb;
 insert into t1 values (ST_geomfromtext("point(0 1)"));
-ERROR 22007: Incorrect POLYGON value: 'POINT' for column `test`.`t1`.`a` at row 1
+ERROR 22007: Incorrect POLYGON value: 'POINT(0 1)' for column `test`.`t1`.`a` at row 1
 insert into t1 values (ST_geomfromtext("point(1 0)"));
-ERROR 22007: Incorrect POLYGON value: 'POINT' for column `test`.`t1`.`a` at row 1
+ERROR 22007: Incorrect POLYGON value: 'POINT(1 0)' for column `test`.`t1`.`a` at row 1
 select * from (select polygon(t1.a) as p from t1 order by t1.a) d;
 p
 drop table t1;

sql/field.cc

@@ -8841,18 +8841,26 @@ int Field_geom::store(const char *from, uint length, CHARSET_INFO *cs)
     {
       const char *db= table->s->db.str;
       const char *tab_name= table->s->table_name.str;
+      Geometry_buffer buffer;
+      Geometry *geom= NULL;
+      String wkt;
+      const char *dummy;
 
       if (!db)
         db= "";
       if (!tab_name)
         tab_name= "";
+      wkt.set_charset(&my_charset_latin1);
+      if (!(geom= Geometry::construct(&buffer, from, length)) ||
+          geom->as_wkt(&wkt, &dummy))
+        goto err;
 
       my_error(ER_TRUNCATED_WRONG_VALUE_FOR_FIELD, MYF(0),
                Geometry::ci_collection[geom_type]->m_name.str,
-               Geometry::ci_collection[wkb_type]->m_name.str,
-               db, tab_name, field_name,
+               wkt.c_ptr(), db, tab_name, field_name,
                (ulong) table->in_use->get_stmt_da()->
                current_row_for_warning());
+
       goto err_exit;
     }