Merge mysql.com:/home/hf/work/27921/my50-27921

into  mysql.com:/home/hf/work/27921/my51-27921

mysql-test/r/view.result

@@ -3346,6 +3346,19 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 NULL	UNION RESULT	<union1,2>	ALL	NULL	NULL	NULL	NULL	NULL	Using filesort
 DROP VIEW v1;
 DROP TABLE t1;
+CREATE VIEW v1 AS SELECT CAST( 1.23456789 AS DECIMAL( 7,5 ) ) AS col;
+SELECT * FROM v1;
+col
+1.23457
+DESCRIBE v1;
+Field	Type	Null	Key	Default	Extra
+col	decimal(7,5)	NO		0.00000	
+DROP VIEW v1;
+CREATE VIEW v1 AS SELECT CAST(1.23456789 AS DECIMAL(8,0)) AS col;
+SHOW CREATE VIEW v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select cast(1.23456789 as decimal(8,0)) AS `col`
+DROP VIEW v1;
 End of 5.0 tests.
 DROP DATABASE IF EXISTS `d-1`;
 CREATE DATABASE `d-1`;

sql/field.cc

@@ -8772,8 +8772,7 @@ bool create_field::init(THD *thd, char *fld_name, enum_field_types fld_type,
   case MYSQL_TYPE_NULL:
     break;
   case MYSQL_TYPE_NEWDECIMAL:
-    if (!fld_length && !decimals)
-      length= 10;
+    my_decimal_trim(&length, &decimals);
     if (length > DECIMAL_MAX_PRECISION)
     {
       my_error(ER_TOO_BIG_PRECISION, MYF(0), length, fld_name,

sql/item_create.cc

@@ -3916,6 +3916,7 @@ Create_func_master_pos_wait Create_func_master_pos_wait::s_singleton;
 Item*
 Create_func_master_pos_wait::create_native(THD *thd, LEX_STRING name,
                                            List<Item> *item_list)
+
 {
   Item *func= NULL;
   int arg_count= 0;
@@ -3946,7 +3947,6 @@ Create_func_master_pos_wait::create_native(THD *thd, LEX_STRING name,
     my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
     break;
   }
-  }
 
   return func;
 }
@@ -4970,11 +4970,15 @@ find_qualified_function_builder(THD *thd)
   return & Create_sp_func::s_singleton;
 }
 
-Item*
-create_func_cast(THD *thd, Item *a, Cast_target cast_type, int len, int dec,
+
+Item *
+create_func_cast(Item *a, Cast_target cast_type,
+                 const char *c_len, const char *c_dec,
                  CHARSET_INFO *cs)
 {
   Item *res;
+  ulong len;
+  uint dec;
   LINT_INIT(res);
 
   switch (cast_type) {
@@ -4998,18 +5002,21 @@ create_func_cast(THD *thd, Item *a, Cast_target cast_type, int len, int dec,
     break;
   case ITEM_CAST_DECIMAL:
   {
-    int tmp_len= (len>0) ? len : 10;
-    if (tmp_len < dec)
+    len= c_len ? atoi(c_len) : 0;
+    dec= c_dec ? atoi(c_dec) : 0;
+    my_decimal_trim(&len, &dec);
+    if (len < dec)
     {
       my_error(ER_M_BIGGER_THAN_D, MYF(0), "");
       return 0;
     }
-    res= new (thd->mem_root) Item_decimal_typecast(a, tmp_len, dec);
+    res= new (thd->mem_root) Item_decimal_typecast(a, len, dec);
     break;
   }
   case ITEM_CAST_CHAR:
   {
     CHARSET_INFO *real_cs= (cs ? cs : thd->variables.collation_connection);
+    len= c_len ? atoi(c_len) : -1;
     res= new (thd->mem_root) Item_char_typecast(a, len, real_cs);
     break;
   }
@@ -5022,4 +5029,3 @@ create_func_cast(THD *thd, Item *a, Cast_target cast_type, int len, int dec,
   }
   return res;
 }
-

sql/item_create.h

@@ -159,9 +159,9 @@ protected:
   @param dec TODO
   @param cs The character set
 */
-Item*
-create_func_cast(THD *thd, Item *a, Cast_target cast_type, int len, int dec,
+Item *
+create_func_cast(THD *thd, Item *a, Cast_target cast_type,
+                 const char *len, const char *dec,
                  CHARSET_INFO *cs);
-
 #endif
 

sql/item_func.cc

@@ -1080,9 +1080,26 @@ err:
 
 void Item_decimal_typecast::print(String *str)
 {
+  char len_buf[20*3 + 1];
+  char *end;
+  CHARSET_INFO *cs= str->charset();
+
+  uint precision= my_decimal_length_to_precision(max_length, decimals,
+                                                 unsigned_flag);
   str->append(STRING_WITH_LEN("cast("));
   args[0]->print(str);
-  str->append(STRING_WITH_LEN(" as decimal)"));
+  str->append(STRING_WITH_LEN(" as decimal("));
+
+  end=int10_to_str(precision, len_buf,10);
+  str->append(len_buf, (uint32) (end - len_buf));
+
+  str->append(',');
+
+  end=int10_to_str(decimals, len_buf,10);
+  str->append(len_buf, (uint32) (end - len_buf));
+
+  str->append(')');
+  str->append(')');
 }
 
 

sql/item_func.h

@@ -333,8 +333,8 @@ class Item_decimal_typecast :public Item_func
 public:
   Item_decimal_typecast(Item *a, int len, int dec) :Item_func(a)
   {
-    max_length= len + 2;
     decimals= dec;
+    max_length= my_decimal_precision_to_length(len, dec, unsigned_flag);
   }
   String *val_str(String *str);
   double val_real();

sql/my_decimal.h

@@ -395,5 +395,16 @@ int my_decimal_intg(const my_decimal *a)
 }
 
 
+void my_decimal_trim(ulong *precision, uint *scale)
+{
+  if (!(*precision) && !(*scale))
+  {
+    *precision= 10;
+    *scale= 0;
+    return;
+  }
+}
+
+
 #endif /*my_decimal_h*/
 

sql/sql_yacc.yy

@@ -6477,15 +6477,13 @@ simple_expr:
           }
 	| BINARY simple_expr %prec NEG
 	  {
-            $$= create_func_cast(YYTHD, $2, ITEM_CAST_CHAR, -1, 0,
+            $$= create_func_cast(YYTHD, $2, ITEM_CAST_CHAR, NULL, NULL,
                                  &my_charset_bin);
 	  }
 	| CAST_SYM '(' expr AS cast_type ')'
 	  {
             LEX *lex= Lex;
-	    $$= create_func_cast(YYTHD, $3, $5,
-                                 lex->length ? atoi(lex->length) : -1,
-                                 lex->dec ? atoi(lex->dec) : 0,
+	    $$= create_func_cast(YYTHD, $3, $5, lex->length, lex->dec,
                                  lex->charset);
             if (!$$)
               MYSQL_YYABORT;
@@ -6494,9 +6492,7 @@ simple_expr:
 	  { $$= new (YYTHD->mem_root) Item_func_case(* $3, $2, $4 ); }
 	| CONVERT_SYM '(' expr ',' cast_type ')'
 	  {
-	    $$= create_func_cast(YYTHD, $3, $5,
-				 Lex->length ? atoi(Lex->length) : -1,
-                                 Lex->dec ? atoi(Lex->dec) : 0,
+	    $$= create_func_cast(YYTHD, $3, $5, Lex->length, Lex->dec,
                                  Lex->charset);
             if (!$$)
               MYSQL_YYABORT;