bug #14807 (GeomFromText() should return MYSQL_TYPE_GEOMETRY)

we didn't have code creating GEOMETRY-type fields from Items (expression results)
So i added this code

mysql-test/r/gis.result

@@ -574,11 +574,11 @@ INSERT INTO t1 VALUES(GeomFromText('POINT(367894677 368542487)'));
 INSERT INTO t1 VALUES(GeomFromText('POINT(580848489 219587743)'));
 INSERT INTO t1 VALUES(GeomFromText('POINT(11247614 782797569)'));
 drop table t1;
-create table t1 select POINT(1,3);
+create table t1 select GeomFromWKB(POINT(1,3));
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `POINT(1,3)` longblob NOT NULL
+  `GeomFromWKB(POINT(1,3))` geometry NOT NULL default ''
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 CREATE TABLE `t1` (`object_id` bigint(20) unsigned NOT NULL default '0', `geo`
@@ -704,3 +704,8 @@ Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is
 def					asbinary(g)	252	8192	0	Y	128	0	63
 asbinary(g)
 drop table t1;
+create table t1 select GeomFromText('point(1 1)');
+desc t1;
+Field	Type	Null	Key	Default	Extra
+GeomFromText('point(1 1)')	geometry	NO			
+drop table t1;

mysql-test/t/gis.test

@@ -281,7 +281,7 @@ INSERT INTO t1 VALUES(GeomFromText('POINT(580848489 219587743)'));
 INSERT INTO t1 VALUES(GeomFromText('POINT(11247614 782797569)')); 
 drop table t1;
 
-create table t1 select POINT(1,3);
+create table t1 select GeomFromWKB(POINT(1,3));
 show create table t1;
 drop table t1;
 
@@ -416,3 +416,9 @@ select * from t1;
 select asbinary(g) from t1;
 --disable_metadata
 drop table t1;
+
+
+create table t1 select GeomFromText('point(1 1)');
+desc t1;
+drop table t1;
+

sql/item_geofunc.cc

@@ -25,6 +25,12 @@
 #ifdef HAVE_SPATIAL
 #include <m_ctype.h>
 
+Field *Item_geometry_func::tmp_table_field(TABLE *t_arg)
+{
+  return new Field_geom(max_length, maybe_null, name, t_arg,
+                        (Field::geometry_type) get_geometry_type());
+}
+
 void Item_geometry_func::fix_length_and_dec()
 {
   collation.set(&my_charset_bin);
@@ -32,6 +38,10 @@ void Item_geometry_func::fix_length_and_dec()
   max_length=MAX_BLOB_WIDTH;
 }
 
+int Item_geometry_func::get_geometry_type() const
+{
+  return (int)Field::GEOM_GEOMETRY;
+}
 
 String *Item_func_geometry_from_text::val_str(String *str)
 {
@@ -152,6 +162,12 @@ String *Item_func_geometry_type::val_str(String *str)
 }
 
 
+int Item_func_envelope::get_geometry_type() const
+{
+  return (int) Field::GEOM_POLYGON;
+}
+
+
 String *Item_func_envelope::val_str(String *str)
 {
   DBUG_ASSERT(fixed == 1);
@@ -176,6 +192,12 @@ String *Item_func_envelope::val_str(String *str)
 }
 
 
+int Item_func_centroid::get_geometry_type() const
+{
+  return (int) Field::GEOM_POINT;
+}
+
+
 String *Item_func_centroid::val_str(String *str)
 {
   DBUG_ASSERT(fixed == 1);
@@ -310,6 +332,12 @@ err:
 */
 
 
+int Item_func_point::get_geometry_type() const
+{
+  return (int) Field::GEOM_POINT;
+}
+
+
 String *Item_func_point::val_str(String *str)
 {
   DBUG_ASSERT(fixed == 1);

sql/item_geofunc.h

@@ -33,6 +33,8 @@ public:
   Item_geometry_func(List<Item> &list) :Item_str_func(list) {}
   void fix_length_and_dec();
   enum_field_types field_type() const  { return MYSQL_TYPE_GEOMETRY; }
+  Field *tmp_table_field(TABLE *t_arg);
+  virtual int get_geometry_type() const;
 };
 
 class Item_func_geometry_from_text: public Item_geometry_func
@@ -89,6 +91,7 @@ public:
   Item_func_centroid(Item *a): Item_geometry_func(a) {}
   const char *func_name() const { return "centroid"; }
   String *val_str(String *);
+  int get_geometry_type() const;
 };
 
 class Item_func_envelope: public Item_geometry_func
@@ -97,6 +100,7 @@ public:
   Item_func_envelope(Item *a): Item_geometry_func(a) {}
   const char *func_name() const { return "envelope"; }
   String *val_str(String *);
+  int get_geometry_type() const;
 };
 
 class Item_func_point: public Item_geometry_func
@@ -106,6 +110,7 @@ public:
   Item_func_point(Item *a, Item *b, Item *srid): Item_geometry_func(a, b, srid) {}
   const char *func_name() const { return "point"; }
   String *val_str(String *);
+  int get_geometry_type() const;
 };
 
 class Item_func_spatial_decomp: public Item_geometry_func