LTRIM, RTRIM and TRIM now honors coercibility

LTRIM, RTRIM and TRIM now work fine with ucs2

sql/item_create.cc

@@ -266,7 +266,7 @@ Item *create_func_lpad(Item* a, Item *b, Item *c)
 
 Item *create_func_ltrim(Item* a)
 {
-  return new Item_func_ltrim(a,new Item_string(" ",1,default_charset_info));
+  return new Item_func_ltrim(a);
 }
 
 Item *create_func_md5(Item* a)
@@ -365,7 +365,7 @@ Item *create_func_rpad(Item* a, Item *b, Item *c)
 
 Item *create_func_rtrim(Item* a)
 {
-  return new Item_func_rtrim(a,new Item_string(" ",1,default_charset_info));
+  return new Item_func_rtrim(a);
 }
 
 Item *create_func_sec_to_time(Item* a)

sql/item_strfunc.cc

@@ -1136,7 +1136,7 @@ String *Item_func_ltrim::val_str(String *str)
     return 0;					/* purecov: inspected */
   char buff[MAX_FIELD_WIDTH];
   String tmp(buff,sizeof(buff),res->charset());
-  String *remove_str=args[1]->val_str(&tmp);
+  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
   uint remove_length;
   LINT_INIT(remove_length);
 
@@ -1174,7 +1174,7 @@ String *Item_func_rtrim::val_str(String *str)
     return 0; /* purecov: inspected */
   char buff[MAX_FIELD_WIDTH];
   String tmp(buff,sizeof(buff),res->charset());
-  String *remove_str=args[1]->val_str(&tmp);
+  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
   uint remove_length;
   LINT_INIT(remove_length);
 
@@ -1246,7 +1246,7 @@ String *Item_func_trim::val_str(String *str)
     return 0;					/* purecov: inspected */
   char buff[MAX_FIELD_WIDTH];
   String tmp(buff,sizeof(buff),res->charset());
-  String *remove_str=args[1]->val_str(&tmp);
+  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
   uint remove_length;
   LINT_INIT(remove_length);
 
@@ -1291,6 +1291,29 @@ String *Item_func_trim::val_str(String *str)
   return &tmp_value;
 }
 
+void Item_func_trim::fix_length_and_dec()
+{
+  max_length= args[0]->max_length;
+  if (arg_count == 1)
+  {
+    set_charset(args[0]->charset(), args[0]->coercibility);
+    remove.set_charset(charset());
+    remove.set_ascii(" ",1);
+  }
+  else
+  if (set_charset(args[1]->charset(), args[1]->coercibility,
+		  args[0]->charset(), args[0]->coercibility))
+  {
+    my_error(ER_CANT_AGGREGATE_COLLATIONS,MYF(0),
+	     args[1]->charset()->name,coercion_name(args[1]->coercibility),
+	     args[0]->charset()->name,coercion_name(args[0]->coercibility),
+	     func_name());
+  }
+}
+
+
+
+
 void Item_func_password::fix_length_and_dec()
 {
   /*

sql/item_strfunc.h

@@ -220,35 +220,37 @@ public:
 };
 
 
-class Item_func_ltrim :public Item_str_func
+class Item_func_trim :public Item_str_func
 {
+protected:
   String tmp_value;
+  String remove;
 public:
-  Item_func_ltrim(Item *a,Item *b) :Item_str_func(a,b) {}
+  Item_func_trim(Item *a,Item *b) :Item_str_func(a,b) {}
+  Item_func_trim(Item *a) :Item_str_func(a) {}
   String *val_str(String *);
-  void fix_length_and_dec() { max_length= args[0]->max_length; }
-  const char *func_name() const { return "ltrim"; }
+  void fix_length_and_dec();
+  const char *func_name() const { return "trim"; }
 };
 
 
-class Item_func_rtrim :public Item_str_func
+class Item_func_ltrim :public Item_func_trim
 {
-  String tmp_value;
 public:
-  Item_func_rtrim(Item *a,Item *b) :Item_str_func(a,b) {}
+  Item_func_ltrim(Item *a,Item *b) :Item_func_trim(a,b) {}
+  Item_func_ltrim(Item *a) :Item_func_trim(a) {}
   String *val_str(String *);
-  void fix_length_and_dec() { max_length= args[0]->max_length; }
-  const char *func_name() const { return "rtrim"; }
+  const char *func_name() const { return "ltrim"; }
 };
 
-class Item_func_trim :public Item_str_func
+
+class Item_func_rtrim :public Item_func_trim
 {
-  String tmp_value;
 public:
-  Item_func_trim(Item *a,Item *b) :Item_str_func(a,b) {}
+  Item_func_rtrim(Item *a,Item *b) :Item_func_trim(a,b) {}
+  Item_func_rtrim(Item *a) :Item_func_trim(a) {}
   String *val_str(String *);
-  void fix_length_and_dec() { max_length= args[0]->max_length; }
-  const char *func_name() const { return "trim"; }
+  const char *func_name() const { return "rtrim"; }
 };
 
 

sql/sql_yacc.yy

@@ -593,7 +593,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %type <item>
 	literal text_literal insert_ident order_ident
 	simple_ident select_item2 expr opt_expr opt_else sum_expr in_sum_expr
-	table_wild opt_pad no_in_expr expr_expr simple_expr no_and_expr
+	table_wild no_in_expr expr_expr simple_expr no_and_expr
 	using_list expr_or_default set_expr_or_default interval_expr
 	param_marker singlerow_subselect singlerow_subselect_init
 	exists_subselect exists_subselect_init
@@ -2479,13 +2479,19 @@ simple_expr:
 	| SUBSTRING_INDEX '(' expr ',' expr ',' expr ')'
 	  { $$= new Item_func_substr_index($3,$5,$7); }
 	| TRIM '(' expr ')'
-	  { $$= new Item_func_trim($3,new Item_string(" ",1,default_charset_info)); }
-	| TRIM '(' LEADING opt_pad FROM expr ')'
+	  { $$= new Item_func_trim($3); }
+	| TRIM '(' LEADING expr FROM expr ')'
 	  { $$= new Item_func_ltrim($6,$4); }
-	| TRIM '(' TRAILING opt_pad FROM expr ')'
+	| TRIM '(' TRAILING expr FROM expr ')'
 	  { $$= new Item_func_rtrim($6,$4); }
-	| TRIM '(' BOTH opt_pad FROM expr ')'
+	| TRIM '(' BOTH expr FROM expr ')'
 	  { $$= new Item_func_trim($6,$4); }
+	| TRIM '(' LEADING FROM expr ')'
+	 { $$= new Item_func_ltrim($5); }
+	| TRIM '(' TRAILING FROM expr ')'
+	  { $$= new Item_func_rtrim($5); }
+	| TRIM '(' BOTH FROM expr ')'
+	  { $$= new Item_func_trim($5); }
 	| TRIM '(' expr FROM expr ')'
 	  { $$= new Item_func_trim($5,$3); }
 	| TRUNCATE_SYM '(' expr ',' expr ')'
@@ -2707,10 +2713,6 @@ when_list2:
 	    sel->when_list.head()->push_back($5);
 	  };
 
-opt_pad:
-	/* empty */ { $$=new Item_string(" ",1,default_charset_info); }
-	| expr	    { $$=$1; };
-
 join_table_list:
 	'(' join_table_list ')'	{ $$=$2; }
 	| join_table		{ $$=$1; }