Manual merge

sql/item.h

@@ -126,8 +126,8 @@ class Item {
      top AND/OR ctructure of WHERE clause to protect it of
      optimisation changes in prepared statements
   */
-  Item(THD *thd, Item &item);
-  virtual ~Item() { name=0; cleanup(); }		/*lint -e1509 */
+  Item(THD *thd, Item *item);
+  virtual ~Item() { name=0; }		/*lint -e1509 */
   void set_name(const char *str,uint length, CHARSET_INFO *cs);
   void init_make_field(Send_field *tmp_field,enum enum_field_types type);
   virtual void cleanup() { fixed=0; }
@@ -206,6 +206,7 @@ class Item {
   virtual Item *get_tmp_table_item(THD *thd) { return copy_or_same(thd); }
 
   CHARSET_INFO *default_charset() const;
+  virtual CHARSET_INFO *compare_collation() { return NULL; }
 
   virtual bool walk(Item_processor processor, byte *arg)
   {
@@ -239,6 +240,11 @@ class Item {
   
   /* Used in sql_select.cc:eliminate_not_funcs() */
   virtual Item *neg_transformer() { return NULL; }
+  void delete_self()
+  {
+    cleanup();
+    delete this;
+  }
 };
 
 
@@ -304,7 +310,10 @@ class Item_splocal : public Item
 
   inline void make_field(Send_field *field)
   {
-    this_item()->make_field(field);
+    Item *it= this_item();
+
+    it->set_name(m_name.str, m_name.length, system_charset_info);
+    it->make_field(field);
   }
 
   inline Item_result result_type() const
@@ -326,6 +335,11 @@ class Item_splocal : public Item
   {
     str->append(m_name.str, m_name.length);
   }
+
+  inline bool send(Protocol *protocol, String *str)
+  {
+    return this_item()->send(protocol, str);
+  }
 };
 
 
@@ -339,7 +353,7 @@ class Item_ident :public Item
   st_select_lex *depended_from;
   Item_ident(const char *db_name_par,const char *table_name_par,
 	     const char *field_name_par);
-  Item_ident(THD *thd, Item_ident &item);
+  Item_ident(THD *thd, Item_ident *item);
   const char *full_name() const;
 
   bool remove_dependence_processor(byte * arg);
@@ -362,7 +376,7 @@ class Item_field :public Item_ident
      item_equal(0)
   { collation.set(DERIVATION_IMPLICIT); }
   // Constructor need to process subselect with temporary tables (see Item)
-  Item_field(THD *thd, Item_field &item);
+  Item_field(THD *thd, Item_field *item);
   Item_field(Field *field);
   enum Type type() const { return FIELD_ITEM; }
   bool eq(const Item *item, bool binary_cmp) const;
@@ -393,6 +407,7 @@ class Item_field :public Item_ident
   bool get_time(TIME *ltime);
   bool is_null() { return field->is_null(); }
   Item *get_tmp_table_item(THD *thd);
+  void cleanup();
   Item_equal *find_item_equal(COND_EQUAL *cond_equal);
   Item *equal_fields_propagator(byte *arg);
   bool replace_equal_field_processor(byte *arg);
@@ -583,7 +598,7 @@ class Item_string :public Item
   	      CHARSET_INFO *cs, Derivation dv= DERIVATION_COERCIBLE)
   {
     collation.set(cs, dv);
-    str_value.set(str,length,cs);
+    str_value.set_or_copy_aligned(str,length,cs);
     /*
       We have to have a different max_length than 'length' here to
       ensure that we get the right length if we do use the item
@@ -599,12 +614,11 @@ class Item_string :public Item
 	      CHARSET_INFO *cs, Derivation dv= DERIVATION_COERCIBLE)
   {
     collation.set(cs, dv);
-    str_value.set(str,length,cs);
+    str_value.set_or_copy_aligned(str,length,cs);
     max_length= str_value.numchars()*cs->mbmaxlen;
     set_name(name_par,0,cs);
     decimals=NOT_FIXED_DEC;
   }
-  ~Item_string() {}
   enum Type type() const { return STRING_ITEM; }
   double val()
   { 
@@ -671,7 +685,6 @@ class Item_varbinary :public Item
 {
 public:
   Item_varbinary(const char *str,uint str_length);
-  ~Item_varbinary() {}
   enum Type type() const { return VARBIN_ITEM; }
   double val() { return (double) Item_varbinary::val_int(); }
   longlong val_int();
@@ -688,8 +701,8 @@ class Item_result_field :public Item	/* Item with result field */
   Field *result_field;				/* Save result here */
   Item_result_field() :result_field(0) {}
   // Constructor used for Item_sum/Item_cond_and/or (see Item comment)
-  Item_result_field(THD *thd, Item_result_field &item):
-    Item(thd, item), result_field(item.result_field)
+  Item_result_field(THD *thd, Item_result_field *item):
+    Item(thd, item), result_field(item->result_field)
   {}
   ~Item_result_field() {}			/* Required with gcc 2.95 */
   Field *get_tmp_table_field() { return result_field; }
@@ -708,20 +721,25 @@ class Item_result_field :public Item	/* Item with result field */
 class Item_ref :public Item_ident
 {
 public:
-  Field *result_field;				/* Save result here */
+  Field *result_field;			 /* Save result here */
   Item **ref;
-  Item_ref(const char *db_par, const char *table_name_par,
-	   const char *field_name_par)
-    :Item_ident(db_par,table_name_par,field_name_par),ref(0) {}
-  Item_ref(Item **item, const char *table_name_par, const char *field_name_par)
-    :Item_ident(NullS,table_name_par,field_name_par),ref(item) {}
+  Item **hook_ptr;                       /* These two to restore  */
+  Item *orig_item;                       /* things in 'cleanup()' */
+  Item_ref(Item **hook, Item *original,const char *db_par,
+	   const char *table_name_par, const char *field_name_par)
+    :Item_ident(db_par,table_name_par,field_name_par),ref(0), hook_ptr(hook),
+    orig_item(original) {}
+  Item_ref(Item **item, Item **hook, 
+	   const char *table_name_par, const char *field_name_par)
+    :Item_ident(NullS,table_name_par,field_name_par),
+    ref(item), hook_ptr(hook), orig_item(hook ? *hook:0) {}
   // Constructor need to process subselect with temporary tables (see Item)
-  Item_ref(THD *thd, Item_ref &item)
-    :Item_ident(thd, item), ref(item.ref) {}
+  Item_ref(THD *thd, Item_ref *item, Item **hook)
+    :Item_ident(thd, item), ref(item->ref), 
+    hook_ptr(hook), orig_item(hook ? *hook : 0) {}
   enum Type type() const		{ return REF_ITEM; }
   bool eq(const Item *item, bool binary_cmp) const
   { return ref && (*ref)->eq(item, binary_cmp); }
-  ~Item_ref() { if (ref && (*ref) && (*ref) != this) delete *ref; }
   double val()
   {
     double tmp=(*ref)->val_result();
@@ -766,6 +784,7 @@ class Item_ref :public Item_ident
   }
   Item *real_item() { return *ref; }
   void print(String *str);
+  void cleanup();
 };
 
 class Item_in_subselect;
@@ -776,7 +795,7 @@ class Item_ref_null_helper: public Item_ref
 public:
   Item_ref_null_helper(Item_in_subselect* master, Item **item,
 		       const char *table_name_par, const char *field_name_par):
-    Item_ref(item, table_name_par, field_name_par), owner(master) {}
+    Item_ref(item, NULL, table_name_par, field_name_par), owner(master) {}
   double val();
   longlong val_int();
   String* val_str(String* s);
@@ -840,7 +859,6 @@ class Item_copy_string :public Item
     name=item->name;
     cached_field_type= item->field_type();
   }
-  ~Item_copy_string() { delete item; }
   enum Type type() const { return COPY_STR_ITEM; }
   enum Item_result result_type () const { return STRING_RESULT; }
   enum_field_types field_type() const { return cached_field_type; }
@@ -997,13 +1015,15 @@ class Item_cache: public Item
   void set_used_tables(table_map map) { used_table_map= map; }
 
   virtual bool allocate(uint i) { return 0; };
-  virtual bool setup(Item *item) { example= item;  return 0; };
-  virtual void store(Item *)= 0;
-  void set_len_n_dec(uint32 max_len, uint8 dec)
+  virtual bool setup(Item *item)
   {
-    max_length= max_len;
-    decimals= dec;
-  }
+    example= item;
+    max_length= item->max_length;
+    decimals= item->decimals;
+    collation.set(item->collation);
+    return 0;
+  };
+  virtual void store(Item *)= 0;
   enum Type type() const { return CACHE_ITEM; }
   static Item_cache* get_cache(Item_result type);
   table_map used_tables() const { return used_table_map; }
@@ -1028,7 +1048,7 @@ class Item_cache_real: public Item_cache
   double value;
 public:
   Item_cache_real(): Item_cache() {}
-  
+
   void store(Item *item);
   double val() { return value; }
   longlong val_int() { return (longlong) (value+(value > 0 ? 0.5 : -0.5)); }
@@ -1101,6 +1121,11 @@ class Item_cache_row: public Item_cache
   bool check_cols(uint c);
   bool null_inside();
   void bring_value();
+  void cleanup()
+  {
+    Item_cache::cleanup();
+    values= 0;
+  }
 };
 
 
@@ -1111,6 +1136,7 @@ class Item_type_holder: public Item
 {
 protected:
   Item_result item_type;
+  Item_result orig_type;
   Field *field_example;
 public:
   Item_type_holder(THD*, Item*);
@@ -1122,6 +1148,11 @@ class Item_type_holder: public Item
   String *val_str(String*);
   bool join_types(THD *thd, Item *);
   Field *example() { return field_example; }
+  void cleanup()
+  {
+    Item::cleanup();
+    item_type= orig_type;
+  }
 };
 
 

sql/opt_range.cc

@@ -301,10 +301,11 @@ typedef struct st_qsel_param {
   uint imerge_cost_buff_size; /* size of the buffer */
 } PARAM;
 
-static SEL_TREE * get_mm_parts(PARAM *param,Field *field,
+static SEL_TREE * get_mm_parts(PARAM *param,COND *cond_func,Field *field,
 			       Item_func::Functype type,Item *value,
 			       Item_result cmp_type);
-static SEL_ARG *get_mm_leaf(PARAM *param,Field *field,KEY_PART *key_part,
+static SEL_ARG *get_mm_leaf(PARAM *param,COND *cond_func,Field *field,
+			    KEY_PART *key_part,
 			    Item_func::Functype type,Item *value);
 static SEL_TREE *get_mm_tree(PARAM *param,COND *cond);
 static ha_rows check_quick_select(PARAM *param,uint index,SEL_ARG *key_tree);
@@ -612,14 +613,25 @@ SQL_SELECT::SQL_SELECT() :quick(0),cond(0),free_cond(0)
 }
 
 
-SQL_SELECT::~SQL_SELECT()
+void SQL_SELECT::cleanup()
 {
   delete quick;
+  quick= 0;
   if (free_cond)
+  {
+    free_cond=0;
     delete cond;
+    cond= 0;
+  }    
   close_cached_file(&file);
 }
 
+
+SQL_SELECT::~SQL_SELECT()
+{
+  cleanup();
+}
+
 #undef index					// Fix for Unixware 7
 
 QUICK_SELECT_I::QUICK_SELECT_I()
@@ -1746,7 +1758,8 @@ static SEL_TREE *get_mm_tree(PARAM *param,COND *cond)
 
 
 static SEL_TREE *
-get_mm_parts(PARAM *param, Field *field, Item_func::Functype type, 
+get_mm_parts(PARAM *param, COND *cond_func, Field *field,
+	     Item_func::Functype type, 
 	     Item *value, Item_result cmp_type)
 {
   DBUG_ENTER("get_mm_parts");
@@ -1768,7 +1781,8 @@ get_mm_parts(PARAM *param, Field *field, Item_func::Functype type,
 	DBUG_RETURN(0);				// OOM
       if (!value || !(value->used_tables() & ~param->read_tables))
       {
-	sel_arg=get_mm_leaf(param,key_part->field,key_part,type,value);
+	sel_arg=get_mm_leaf(param,cond_func,
+			    key_part->field,key_part,type,value);
 	if (!sel_arg)
 	  continue;
 	if (sel_arg->type == SEL_ARG::IMPOSSIBLE)
@@ -1794,7 +1808,7 @@ get_mm_parts(PARAM *param, Field *field, Item_func::Functype type,
 
 
 static SEL_ARG *
-get_mm_leaf(PARAM *param, Field *field, KEY_PART *key_part,
+get_mm_leaf(PARAM *param, COND *conf_func, Field *field, KEY_PART *key_part,
 	    Item_func::Functype type,Item *value)
 {
   uint maybe_null=(uint) field->real_maybe_null(), copies;
@@ -1803,6 +1817,32 @@ get_mm_leaf(PARAM *param, Field *field, KEY_PART *key_part,
   char *str, *str2;
   DBUG_ENTER("get_mm_leaf");
 
+  if (!value)					// IS NULL or IS NOT NULL
+  {
+    if (field->table->outer_join)		// Can't use a key on this
+      DBUG_RETURN(0);
+    if (!maybe_null)				// Not null field
+      DBUG_RETURN(type == Item_func::ISNULL_FUNC ? &null_element : 0);
+    if (!(tree=new SEL_ARG(field,is_null_string,is_null_string)))
+      DBUG_RETURN(0);		// out of memory
+    if (type == Item_func::ISNOTNULL_FUNC)
+    {
+      tree->min_flag=NEAR_MIN;		    /* IS NOT NULL ->  X > NULL */
+      tree->max_flag=NO_MAX_RANGE;
+    }
+    DBUG_RETURN(tree);
+  }
+
+  /*
+    We can't use an index when comparing strings of 
+    different collations 
+  */
+  if (field->result_type() == STRING_RESULT &&
+      value->result_type() == STRING_RESULT &&
+      key_part->image_type == Field::itRAW &&
+      ((Field_str*)field)->charset() != conf_func->compare_collation())
+    DBUG_RETURN(0);
+
   if (type == Item_func::LIKE_FUNC)
   {
     bool like_error;
@@ -1866,22 +1906,6 @@ get_mm_leaf(PARAM *param, Field *field, KEY_PART *key_part,
     DBUG_RETURN(new SEL_ARG(field,min_str,max_str));
   }
 
-  if (!value)					// IS NULL or IS NOT NULL
-  {
-    if (field->table->outer_join)		// Can't use a key on this
-      DBUG_RETURN(0);
-    if (!maybe_null)				// Not null field
-      DBUG_RETURN(type == Item_func::ISNULL_FUNC ? &null_element : 0);
-    if (!(tree=new SEL_ARG(field,is_null_string,is_null_string)))
-      DBUG_RETURN(0);		// out of memory
-    if (type == Item_func::ISNOTNULL_FUNC)
-    {
-      tree->min_flag=NEAR_MIN;		    /* IS NOT NULL ->  X > NULL */
-      tree->max_flag=NO_MAX_RANGE;
-    }
-    DBUG_RETURN(tree);
-  }
-
   if (!field->optimize_range(param->real_keynr[key_part->key]) &&
       type != Item_func::EQ_FUNC &&
       type != Item_func::EQUAL_FUNC)
@@ -1895,7 +1919,7 @@ get_mm_leaf(PARAM *param, Field *field, KEY_PART *key_part,
       value->result_type() != STRING_RESULT &&
       field->cmp_type() != value->result_type())
     DBUG_RETURN(0);
-
+ 
   if (value->save_in_field(field, 1) > 0)
   {
     /* This happens when we try to insert a NULL field in a not null column */
@@ -3097,6 +3121,7 @@ check_quick_select(PARAM *param,uint idx,SEL_ARG *tree)
     param->table->quick_rows[key]=records;
     param->table->quick_key_parts[key]=param->max_key_part+1;
   }
+  DBUG_PRINT("exit", ("Records: %lu", (ulong) records));
   DBUG_RETURN(records);
 }
 
@@ -3440,8 +3465,30 @@ QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
       key_part->part_length+=HA_KEY_BLOB_LENGTH;
     key_part->null_bit=     key_info->key_part[part].null_bit;
   }
-  if (!insert_dynamic(&quick->ranges,(gptr)&range))
-    return quick;
+  if (insert_dynamic(&quick->ranges,(gptr)&range))
+    goto err;
+
+  /* 
+     Add a NULL range if REF_OR_NULL optimization is used.
+     For example:
+       if we have "WHERE A=2 OR A IS NULL" we created the (A=2) range above
+       and have ref->null_ref_key set. Will create a new NULL range here.
+  */
+  if (ref->null_ref_key)
+  {
+    QUICK_RANGE *null_range;
+
+    *ref->null_ref_key= 1;		// Set null byte then create a range
+    if (!(null_range= new QUICK_RANGE(ref->key_buff, ref->key_length,
+				      ref->key_buff, ref->key_length,
+				      EQ_RANGE)))
+      goto err;
+    *ref->null_ref_key= 0;		// Clear null byte
+    if (insert_dynamic(&quick->ranges,(gptr)&null_range))
+      goto err;
+  }
+
+  return quick;
 
 err:
   delete quick;
@@ -3584,12 +3631,7 @@ int QUICK_RANGE_SELECT::get_next()
     int result;
     if (range)
     {						// Already read through key
-/*       result=((range->flag & EQ_RANGE) ?
-	       file->index_next_same(record, (byte*) range->min_key,
-				     range->min_length) :
-	       file->index_next(record));
-*/
-       result=((range->flag & (EQ_RANGE | GEOM_FLAG) ) ?
+       result=((range->flag & (EQ_RANGE | GEOM_FLAG)) ?
 	       file->index_next_same(record, (byte*) range->min_key,
 				     range->min_length) :
 	       file->index_next(record));