MDEV-12798 Item_param does not preserve exact field type in EXECUTE IMMEDIATE 'CREATE TABLE AS SELECT ?' USING POINT(1,1)

mysql-test/r/gis.result

@@ -4300,5 +4300,23 @@ t2	CREATE TABLE `t2` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 DROP PROCEDURE p1;
 #
+# MDEV-12798 Item_param does not preserve exact field type in EXECUTE IMMEDIATE 'CREATE TABLE AS SELECT ?' USING POINT(1,1)
+#
+EXECUTE IMMEDIATE 'CREATE TABLE t1 AS SELECT ?' USING POINT(1,1);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `?` point NOT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+PREPARE stmt FROM 'CREATE OR REPLACE TABLE t1 AS SELECT ?';
+EXECUTE stmt USING POINT(1,1);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `?` point NOT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+#
 # End of 10.3 tests
 #

mysql-test/t/gis.test

@@ -2293,6 +2293,19 @@ CALL p1('multipolygon');
 CALL p1('geometrycollection');
 DROP PROCEDURE p1;
 
+--echo #
+--echo # MDEV-12798 Item_param does not preserve exact field type in EXECUTE IMMEDIATE 'CREATE TABLE AS SELECT ?' USING POINT(1,1)
+--echo #
+EXECUTE IMMEDIATE 'CREATE TABLE t1 AS SELECT ?' USING POINT(1,1);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+PREPARE stmt FROM 'CREATE OR REPLACE TABLE t1 AS SELECT ?';
+EXECUTE stmt USING POINT(1,1);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+
 --echo #
 --echo # End of 10.3 tests
 --echo #

sql/item.cc

@@ -3767,45 +3767,8 @@ bool Item_param::set_from_item(THD *thd, Item *item)
   struct st_value tmp;
   if (!item->save_in_value(&tmp))
   {
-    unsigned_flag= item->unsigned_flag;
+    if (item->type_handler()->Item_param_set_from_value(thd, this, item, &tmp))
-    switch (item->cmp_type()) {
+      DBUG_RETURN(true);
-    case REAL_RESULT:
-      set_double(tmp.value.m_double);
-      set_handler(&type_handler_double);
-      break;
-    case INT_RESULT:
-      set_int(tmp.value.m_longlong, MY_INT64_NUM_DECIMAL_DIGITS);
-      set_handler(&type_handler_longlong);
-      break;
-    case STRING_RESULT:
-    {
-      value.cs_info.set(thd, item->collation.collation);
-      /*
-        Exact value of max_length is not known unless data is converted to
-        charset of connection, so we have to set it later.
-      */
-      set_handler(&type_handler_varchar);
-
-      if (set_str(tmp.m_string.ptr(), tmp.m_string.length()))
-        DBUG_RETURN(1);
-      break;
-    }
-    case DECIMAL_RESULT:
-    {
-      set_decimal(&tmp.m_decimal, unsigned_flag);
-      set_handler(&type_handler_newdecimal);
-      break;
-    }
-    case TIME_RESULT:
-    {
-      set_time(&tmp.value.m_time, item->max_length, item->decimals);
-      set_handler(item->type_handler());
-      break;
-    }
-    case ROW_RESULT:
-      DBUG_ASSERT(0);
-      set_null();
-    }
   }
   else
     set_null();

sql/item.h

@@ -2943,7 +2943,8 @@ public:
 class Item_param :public Item_basic_value,
                   private Settable_routine_parameter,
                   public Rewritable_query_parameter,
-                  public Type_handler_hybrid_field_type
+                  public Type_handler_hybrid_field_type,
+                  public Type_geometry_attributes
 {
   /*
     NO_VALUE is a special value meaning that the parameter has not been
@@ -3075,6 +3076,9 @@ public:
   const Type_handler *type_handler() const
   { return Type_handler_hybrid_field_type::type_handler(); }
 
+  Field::geometry_type get_geometry_type() const
+  { return Type_geometry_attributes::get_geometry_type(); };
+
   Item_param(THD *thd, const LEX_CSTRING *name_arg,
              uint pos_in_query_arg, uint len_in_query_arg);
 

sql/sql_type.cc

@@ -4180,6 +4180,104 @@ bool Type_handler_time_common::
 
 /***************************************************************************/
 
+bool Type_handler_row::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  DBUG_ASSERT(0);
+  param->set_null();
+  return true;
+}
+
+
+bool Type_handler_real_result::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  param->unsigned_flag= attr->unsigned_flag;
+  param->set_double(val->value.m_double);
+  param->set_handler(&type_handler_double);
+  return false;
+}
+
+
+bool Type_handler_int_result::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  param->unsigned_flag= attr->unsigned_flag;
+  param->set_int(val->value.m_longlong, MY_INT64_NUM_DECIMAL_DIGITS);
+  param->set_handler(&type_handler_longlong);
+  return false;
+}
+
+
+bool Type_handler_decimal_result::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  param->unsigned_flag= attr->unsigned_flag;
+  param->set_decimal(&val->m_decimal, attr->unsigned_flag);
+  param->set_handler(&type_handler_newdecimal);
+  return false;
+}
+
+
+bool Type_handler_string_result::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  param->unsigned_flag= false;
+  param->value.cs_info.set(thd, attr->collation.collation);
+  /*
+    Exact value of max_length is not known unless data is converted to
+    charset of connection, so we have to set it later.
+  */
+  param->set_handler(&type_handler_varchar);
+  return param->set_str(val->m_string.ptr(), val->m_string.length());
+}
+
+
+bool Type_handler_temporal_result::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  param->unsigned_flag= attr->unsigned_flag;
+  param->set_time(&val->value.m_time, attr->max_length, attr->decimals);
+  param->set_handler(this);
+  return false;
+}
+
+
+#ifdef HAVE_SPATIAL
+bool Type_handler_geometry::
+  Item_param_set_from_value(THD *thd,
+                            Item_param *param,
+                            const Type_all_attributes *attr,
+                            const st_value *val) const
+{
+  param->unsigned_flag= false;
+  param->value.cs_info.set(thd, &my_charset_bin);
+  param->set_handler(&type_handler_geometry);
+  param->set_geometry_type(attr->uint_geometry_type());
+  return param->set_str(val->m_string.ptr(), val->m_string.length());
+}
+#endif
+
+/***************************************************************************/
+
 bool Type_handler_null::
       Item_send(Item *item, Protocol *protocol, st_value *buf) const
 {

sql/sql_type.h

@@ -28,6 +28,7 @@
 
 class Field;
 class Item;
+class Item_param;
 class Item_cache;
 class Item_func_or_sum;
 class Item_sum_hybrid;
@@ -698,6 +699,10 @@ public:
 
   virtual uint32 max_display_length(const Item *item) const= 0;
   virtual bool Item_save_in_value(Item *item, st_value *value) const= 0;
+  virtual bool Item_param_set_from_value(THD *thd,
+                                         Item_param *param,
+                                         const Type_all_attributes *attr,
+                                         const st_value *value) const= 0;
   virtual bool Item_send(Item *item, Protocol *p, st_value *buf) const= 0;
   virtual int Item_save_in_field(Item *item, Field *field,
                                  bool no_conversions) const= 0;
@@ -942,6 +947,10 @@ public:
     return DECIMAL_MAX_PRECISION;
   }
   bool Item_save_in_value(Item *item, st_value *value) const;
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   bool Item_send(Item *item, Protocol *protocol, st_value *buf) const
   {
     DBUG_ASSERT(0);
@@ -1164,6 +1173,10 @@ public:
                   SORT_FIELD_ATTR *attr) const;
   uint Item_decimal_precision(const Item *item) const;
   bool Item_save_in_value(Item *item, st_value *value) const;
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
   Item *make_const_item_for_comparison(THD *, Item *src, const Item *cmp) const;
   Item_cache *Item_get_cache(THD *thd, const Item *item) const;
@@ -1226,6 +1239,10 @@ public:
   uint32 max_display_length(const Item *item) const;
   uint Item_decimal_precision(const Item *item) const;
   bool Item_save_in_value(Item *item, st_value *value) const;
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   bool Item_send(Item *item, Protocol *protocol, st_value *buf) const
   {
     return Item_send_str(item, protocol, buf);
@@ -1288,6 +1305,10 @@ public:
                   SORT_FIELD_ATTR *attr) const;
   uint Item_decimal_precision(const Item *item) const;
   bool Item_save_in_value(Item *item, st_value *value) const;
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
   Item *make_const_item_for_comparison(THD *, Item *src, const Item *cmp) const;
   Item_cache *Item_get_cache(THD *thd, const Item *item) const;
@@ -1343,6 +1364,10 @@ public:
   void sortlength(THD *thd,
                   const Type_std_attributes *item,
                   SORT_FIELD_ATTR *attr) const;
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   uint32 max_display_length(const Item *item) const;
   bool can_change_cond_ref_to_const(Item_bool_func2 *target,
                                    Item *target_expr, Item *target_value,
@@ -1419,6 +1444,10 @@ public:
   }
   uint Item_decimal_precision(const Item *item) const;
   bool Item_save_in_value(Item *item, st_value *value) const;
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   bool Item_send(Item *item, Protocol *protocol, st_value *buf) const
   {
     return Item_send_str(item, protocol, buf);
@@ -2182,6 +2211,10 @@ public:
   {
     return false; // Materialization does not work with GEOMETRY columns
   }
+  bool Item_param_set_from_value(THD *thd,
+                                 Item_param *param,
+                                 const Type_all_attributes *attr,
+                                 const st_value *value) const;
   Field *make_conversion_table_field(TABLE *, uint metadata,
                                      const Field *target) const;
   Field *make_table_field(const LEX_CSTRING *name,