Revert change of lower-case-table handling as this breaks how alias works.

Changes like this should be done to 4.1, not to a stable release

mysql-test/r/lowercase_table.result

@@ -6,6 +6,14 @@ id	Word
 1	a
 2	b
 3	c
+SELECT T1.id from T1 LIMIT 1;
+id
+1
+SELECT T2.id from t1 as T2 LIMIT 1;
+id
+1
+SELECT T2.id from t1 as t2 LIMIT 1;
+Unknown table 'T2' in field list
 RENAME TABLE T1 TO T2;
 ALTER TABLE T2 ADD new_col int not null;
 ALTER TABLE T2 RENAME T3;
@@ -21,8 +29,7 @@ select count(*) from t1;
 count(*)
 0
 select count(T1.a) from t1;
-count(T1.a)
-0
+Unknown table 'T1' in field list
 select count(bags.a) from t1 as Bags;
 Unknown table 'bags' in field list
 drop table t1;

mysql-test/t/lowercase_table.test

@@ -6,6 +6,10 @@ drop table if exists t1,t2,t3;
 create table T1 (id int primary key, Word varchar(40) not null, Index(Word));
 INSERT INTO T1 VALUES (1, 'a'), (2, 'b'), (3, 'c');
 SELECT * FROM t1;
+SELECT T1.id from T1 LIMIT 1;
+SELECT T2.id from t1 as T2 LIMIT 1;
+--error 1109
+SELECT T2.id from t1 as t2 LIMIT 1;
 RENAME TABLE T1 TO T2;
 ALTER TABLE T2 ADD new_col int not null;
 ALTER TABLE T2 RENAME T3;
@@ -18,6 +22,7 @@ drop table t3;
 create table t1 (a int);
 select count(*) from T1;
 select count(*) from t1;
+--error 1109
 select count(T1.a) from t1;
 --error 1109
 select count(bags.a) from t1 as Bags;

sql/sql_class.cc

@@ -430,29 +430,6 @@ void THD::close_active_vio()
 }
 #endif
 
-/*****************************************************************************
-  Table Ident
-****************************************************************************/
-  
-
-Table_ident::Table_ident(LEX_STRING db_arg,LEX_STRING table_arg,bool force)
-  :table(table_arg)
-{
-  if (!force && (current_thd->client_capabilities & CLIENT_NO_SCHEMA))
-    db.str=0;
-  else
-    db= db_arg;
-  if (db.str)
-    table_case_convert(db.str,db.length);
-  table_case_convert(table.str,table.length);
-}
-
-Table_ident::Table_ident(LEX_STRING table_arg) :table(table_arg) 
-{
-  db.str=0;
-  table_case_convert(table.str,table.length);
-}
-
 /*****************************************************************************
 ** Functions to provide a interface to select results
 *****************************************************************************/

sql/sql_class.h

@@ -762,8 +762,15 @@ class Table_ident :public Sql_alloc {
  public:
   LEX_STRING db;
   LEX_STRING table;
-  Table_ident(LEX_STRING db_arg,LEX_STRING table_arg,bool force);
-  Table_ident(LEX_STRING table_arg);
+  inline Table_ident(LEX_STRING db_arg,LEX_STRING table_arg,bool force)
+    :table(table_arg)
+  {
+    if (!force && (current_thd->client_capabilities & CLIENT_NO_SCHEMA))
+      db.str=0;
+    else
+      db= db_arg;
+  }
+  inline Table_ident(LEX_STRING table_arg) :table(table_arg) {db.str=0;}
   inline void change_db(char *db_name)
   { db.str= db_name; db.length=(uint) strlen(db_name); }
 };

sql/sql_parse.cc

@@ -3396,10 +3396,7 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
   }
     
   ptr->alias= alias_str;
-#ifdef TO_BE_DELETED
-  if (lower_case_table_names)
-    casedn_str(table->table.str);
-#endif
+  table_case_convert(table->table.str, table->table.length);
   ptr->real_name=table->table.str;
   ptr->real_name_length=table->table.length;
   ptr->lock_type= lock_type;

sql/sql_table.cc

@@ -1463,10 +1463,8 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
   {
     strmov(new_name_buff,new_name);
     fn_same(new_name_buff,table_name,3);
-#ifdef TO_BE_DELETED
     if (lower_case_table_names)
       casedn_str(new_name);
-#endif
     if ((lower_case_table_names &&
 	 !my_strcasecmp(new_name_buff,table_name)) ||
 	(!lower_case_table_names &&

sql/sql_yacc.yy

@@ -3221,20 +3221,16 @@ simple_ident:
 	| ident '.' ident
 	{
 	  SELECT_LEX *sel=Select;
-	  table_case_convert($1.str, $1.length);
 	  $$ = !sel->create_refs || sel->in_sum_expr > 0 ? (Item*) new Item_field(NullS,$1.str,$3.str) : (Item*) new Item_ref(NullS,$1.str,$3.str);
 	}
 	| '.' ident '.' ident
 	{
 	  SELECT_LEX *sel=Select;
-          table_case_convert($2.str,$2.length);
 	  $$ = !sel->create_refs || sel->in_sum_expr > 0 ? (Item*) new Item_field(NullS,$2.str,$4.str) : (Item*) new Item_ref(NullS,$2.str,$4.str);
 	}
 	| ident '.' ident '.' ident
 	{
 	  SELECT_LEX *sel=Select;
-	  table_case_convert($1.str,$1.length);
-	  table_case_convert($3.str,$3.length);
 	  $$ = !sel->create_refs || sel->in_sum_expr > 0 ? (Item*) new Item_field((current_thd->client_capabilities & CLIENT_NO_SCHEMA ? NullS :$1.str),$3.str,$5.str) : (Item*) new Item_ref((current_thd->client_capabilities & CLIENT_NO_SCHEMA ? NullS :$1.str),$3.str,$5.str);
 	};