Clean-up:

- Renaming Item::is_bool_func() to is_bool_type(), to avoid assumption
  that the item is an Item_func derivant.
- Deriving Item_func_spatial_rel from Item_bool_func rather than Item_int_func

mysql-test/r/gis.result

@@ -1732,3 +1732,11 @@ SRID
 0
 102
 drop table t1;
+# Expect an int(1) column to be created
+CREATE TABLE t1 AS SELECT CONTAINS(NULL, NULL);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `CONTAINS(NULL, NULL)` int(1) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;

mysql-test/t/gis.test

@@ -1463,3 +1463,7 @@ create table t1(g GEOMETRY(9,4) REF_SYSTEM_ID=101, pt POINT(8,2), pg GEOMETRY RE
 SELECT SRID from information_schema.geometry_columns WHERE G_TABLE_NAME='t1';
 drop table t1;
 
+-- echo # Expect an int(1) column to be created
+CREATE TABLE t1 AS SELECT CONTAINS(NULL, NULL);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;

sql/item.h

@@ -1123,7 +1123,7 @@ class Item {
   */
   virtual void set_result_field(Field *field) {}
   virtual bool is_result_field() { return 0; }
-  virtual bool is_bool_func() { return 0; }
+  virtual bool is_bool_type() { return false; }
   virtual void save_in_result_field(bool no_conversions) {}
   /*
     set value of aggregate function in case of no rows for grouping were found

sql/item_cmpfunc.h

@@ -128,7 +128,7 @@ class Item_bool_func :public Item_int_func
   Item_bool_func(Item *a, Item *b, Item *c) :Item_int_func(a, b, c) {}
   Item_bool_func(List<Item> &list) :Item_int_func(list) { }
   Item_bool_func(THD *thd, Item_bool_func *item) :Item_int_func(thd, item) {}
-  bool is_bool_func() { return 1; }
+  bool is_bool_type() { return true; }
   void fix_length_and_dec() { decimals=0; max_length=1; }
   uint decimal_precision() const { return 1; }
 };
@@ -847,7 +847,6 @@ class Item_func_nullif :public Item_func_hybrid_field_type
   longlong int_op();
   String *str_op(String *str);
   my_decimal *decimal_op(my_decimal *);
-  bool is_bool_func() { return false; }
   void fix_length_and_dec();
   uint decimal_precision() const { return m_args0_copy->decimal_precision(); }
   const char *func_name() const { return "nullif"; }

sql/item_geofunc.cc

@@ -1001,14 +1001,14 @@ longlong Item_func_spatial_mbr_rel::val_int()
 
 Item_func_spatial_rel::Item_func_spatial_rel(Item *a,Item *b,
                                              enum Functype sp_rel) :
-    Item_int_func(a,b), collector()
+    Item_bool_func(a,b), collector()
 {
   spatial_rel = sp_rel;
 }
 
 
 Item_func_spatial_rel::Item_func_spatial_rel(Item *a,Item *b, Item *mask) :
-    Item_int_func(a,b,mask), spatial_rel(SP_RELATE_FUNC)
+    Item_bool_func(a,b,mask), spatial_rel(SP_RELATE_FUNC)
 {}
 
 

sql/item_geofunc.h

@@ -294,7 +294,7 @@ class Item_func_spatial_mbr_rel: public Item_bool_func2
 };
 
 
-class Item_func_spatial_rel: public Item_int_func
+class Item_func_spatial_rel: public Item_bool_func
 {
   enum Functype spatial_rel;
   Gcalc_heap collector;
@@ -317,9 +317,7 @@ class Item_func_spatial_rel: public Item_int_func
     Item_func::print(str, query_type);
   }
 
-  void fix_length_and_dec() { maybe_null= 1; }
   bool is_null() { (void) val_int(); return null_value; }
-  bool is_bool_func() { return 1; }
   uint decimal_precision() const { return 1; }
   optimize_type select_optimize() const { return OPTIMIZE_OP; }
 };

sql/item_xmlfunc.cc

@@ -392,7 +392,7 @@ class Item_bool :public Item_int
 public:
   Item_bool(int32 i): Item_int(i) {}
   const char *func_name() const { return "xpath_bool"; }
-  bool is_bool_func() { return 1; }
+  bool is_bool_type() { return true; }
 };
 
 
@@ -402,15 +402,14 @@ class Item_bool :public Item_int
   * a node-set is true if and only if it is non-empty
   * a string is true if and only if its length is non-zero
 */
-class Item_xpath_cast_bool :public Item_int_func
+class Item_xpath_cast_bool :public Item_bool_func
 {
   String *pxml;
   String tmp_value;
 public:
   Item_xpath_cast_bool(Item *a, String *pxml_arg)
-    :Item_int_func(a), pxml(pxml_arg) {}
+    :Item_bool_func(a), pxml(pxml_arg) {}
   const char *func_name() const { return "xpath_cast_bool"; }
-  bool is_bool_func() { return 1; }
   longlong val_int()
   {
     if (args[0]->type() == XPATH_NODESET)
@@ -568,7 +567,6 @@ class Item_nodeset_to_const_comparator :public Item_bool_func
     :Item_bool_func(nodeset,cmpfunc), pxml(p) {}
   enum Type type() const { return XPATH_NODESET_CMP; };
   const char *func_name() const { return "xpath_nodeset_to_const_comparator"; }
-  bool is_bool_func() { return 1; }
   bool check_vcol_func_processor(uchar *int_arg) 
   {
     return trace_unsupported_by_check_vcol_func_processor(func_name());
@@ -823,7 +821,7 @@ String *Item_nodeset_func_elementbyindex::val_nodeset(String *nodeset)
                                                                    flt->pos,
                                                                    size);
     int index= (int) (args[1]->val_int()) - 1;
-    if (index >= 0 && (flt->pos == (uint) index || args[1]->is_bool_func()))
+    if (index >= 0 && (flt->pos == (uint) index || args[1]->is_bool_type()))
       ((XPathFilter*)nodeset)->append_element(flt->num, pos++);
   }
   return nodeset;
@@ -1732,7 +1730,7 @@ my_xpath_parse_AxisSpecifier_NodeTest_opt_Predicate_list(MY_XPATH *xpath)
 
     xpath->item= nodeset2bool(xpath, xpath->item);
 
-    if (xpath->item->is_bool_func())
+    if (xpath->item->is_bool_type())
     {
       xpath->context= new Item_nodeset_func_predicate(prev_context,
                                                       xpath->item,

sql/sql_parse.cc

@@ -8755,7 +8755,7 @@ Item *negate_expression(THD *thd, Item *expr)
     /* it is NOT(NOT( ... )) */
     Item *arg= ((Item_func *) expr)->arguments()[0];
     enum_parsing_place place= thd->lex->current_select->parsing_place;
-    if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
+    if (arg->is_bool_type() || place == IN_WHERE || place == IN_HAVING)
       return arg;
     /*
       if it is not boolean function then we have to emulate value of