Fixed CAST( xxx as CHAR)

sql/item.h

@@ -85,12 +85,14 @@ public:
   virtual bool get_date(TIME *ltime,bool fuzzydate);
   virtual bool get_time(TIME *ltime);
   virtual bool is_null() { return 0; };
-  virtual CHARSET_INFO *thd_charset() const;
-  virtual CHARSET_INFO *charset() const { return str_value.charset(); };
-  virtual bool binary() const { return str_value.charset()->state & MY_CS_BINSORT ? 1 : 0 ; }
-  virtual void set_charset(CHARSET_INFO *cs) { str_value.set_charset(cs); }
   virtual bool check_loop(uint id);
   virtual void top_level_item() {}
+
+  virtual bool binary() const
+  { return str_value.charset()->state & MY_CS_BINSORT ? 1 : 0 ; }
+  CHARSET_INFO *thd_charset() const;
+  CHARSET_INFO *charset() const { return str_value.charset(); };
+  void set_charset(CHARSET_INFO *cs) { str_value.set_charset(cs); }
 };
 
 

sql/item_strfunc.cc

@@ -1363,17 +1363,19 @@ String *Item_func_decode::val_str(String *str)
 
 String *Item_func_database::val_str(String *str)
 {
-  if (!current_thd->db)
+  THD *thd= current_thd;
+  if (!thd->db)
     str->length(0);
   else
-    str->copy((const char*) current_thd->db,(uint) strlen(current_thd->db), system_charset_info, thd_charset());
+    str->copy((const char*) thd->db,(uint) strlen(thd->db),
+	      system_charset_info, thd->thd_charset);
   return str;
 }
 
 String *Item_func_user::val_str(String *str)
 {
   THD          *thd=current_thd;
-  CHARSET_INFO *cs=thd_charset();
+  CHARSET_INFO *cs=thd->thd_charset;
   const char   *host=thd->host ? thd->host : thd->ip ? thd->ip : "";
   uint32       res_length=(strlen(thd->user)+strlen(host)+10) * cs->mbmaxlen;
   
@@ -2128,7 +2130,8 @@ String *Item_func_charset::val_str(String *str)
 
   if ((null_value=(args[0]->null_value || !res->charset())))
     return 0;
-  str->copy(res->charset()->name,strlen(res->charset()->name),my_charset_latin1,thd_charset());
+  str->copy(res->charset()->name,strlen(res->charset()->name),
+	    my_charset_latin1, thd_charset());
   return str;
 }
 

sql/item_strfunc.h

@@ -494,6 +494,7 @@ public:
   {
     String *tmp=args[0]->val_str(a);
     null_value=args[0]->null_value;
+    tmp->set_charset(my_charset_bin);
     return tmp;
   }
   void fix_length_and_dec() 

sql/item_timefunc.h

@@ -534,8 +534,17 @@ public:
   Item_typecast(Item *a) :Item_str_func(a) {}
   const char *func_name() const { return "char"; }
   String *val_str(String *a)
-  { a=args[0]->val_str(a); null_value=args[0]->null_value; return a; }
-  void fix_length_and_dec() { max_length=args[0]->max_length; }
+  {
+    String *tmp=args[0]->val_str(a);
+    null_value=args[0]->null_value;
+    tmp->set_charset(charset());
+    return tmp;
+  }
+  void fix_length_and_dec()
+  {
+    set_charset(thd_charset());
+    max_length=args[0]->max_length;
+  }
   void print(String *str);
 };
 
@@ -544,7 +553,11 @@ class Item_char_typecast :public Item_typecast
 {
 public:
   Item_char_typecast(Item *a) :Item_typecast(a) {}
-  void fix_length_and_dec() { binary=0; max_length=args[0]->max_length; }
+  void fix_length_and_dec()
+  {
+    set_charset(thd_charset());
+    max_length=args[0]->max_length;
+  }
 };
 
 

sql/sql_string.h

@@ -72,7 +72,7 @@ public:
     { sql_element_free(ptr_arg); }
   ~String() { free(); }
 
-  inline void set_charset(CHARSET_INFO *charset) { str_charset=charset; }
+  inline void set_charset(CHARSET_INFO *charset) { str_charset= charset; }
   inline CHARSET_INFO *charset() const { return str_charset; }
   inline uint32 length() const { return str_length;}
   inline uint32 alloced_length() const { return Alloced_length;}
@@ -177,7 +177,8 @@ public:
   bool copy();					// Alloc string if not alloced
   bool copy(const String &s);			// Allocate new string
   bool copy(const char *s,uint32 arg_length, CHARSET_INFO *cs);	// Allocate new string
-  bool copy(const char*s,uint32 arg_length, CHARSET_INFO *csfrom, CHARSET_INFO *csto);
+  bool copy(const char*s,uint32 arg_length, CHARSET_INFO *csfrom,
+	    CHARSET_INFO *csto);
   bool append(const String &s);
   bool append(const char *s,uint32 arg_length=0);
   bool append(IO_CACHE* file, uint32 arg_length);