Fix problem in MIN/MAX optimisation (from last patch)

Don't make OLD_PASSWORD() a reserved word

mysql-test/r/explain.result

@@ -31,3 +31,16 @@ drop table t1;
 explain select 1;
 Comment
 No tables used
+create table t1 (a int not null);
+explain select count(*) from t1;
+Comment
+Select tables optimized away
+insert into t1 values(1);
+explain select count(*) from t1;
+Comment
+Select tables optimized away
+insert into t1 values(1);
+explain select count(*) from t1;
+Comment
+Select tables optimized away
+drop table t1;

mysql-test/r/func_crypt.result

@@ -1,6 +1,9 @@
 select length(encrypt('foo', 'ff')) <> 0;
 length(encrypt('foo', 'ff')) <> 0
 1
-select password('test'),length(encrypt('test')),encrypt('test','aa');
-password('test')	length(encrypt('test'))	encrypt('test','aa')
-378b243e220ca493	13	aaqPiZY5xR5l.
+select old_password('test'), password('test');
+old_password('test')	password('test')
+378b243e220ca493	378b243e220ca493
+select length(encrypt('test')), encrypt('test','aa');
+length(encrypt('test'))	encrypt('test','aa')
+13	aaqPiZY5xR5l.

mysql-test/t/explain.test

@@ -20,3 +20,11 @@ explain select * from t1 ignore key (str,str,foo) where str="foo";
 drop table t1;
 
 explain select 1;
+
+create table t1 (a int not null);
+explain select count(*) from t1;
+insert into t1 values(1);
+explain select count(*) from t1;
+insert into t1 values(1);
+explain select count(*) from t1;
+drop table t1;

mysql-test/t/func_crypt.test

@@ -2,4 +2,5 @@
 
 select length(encrypt('foo', 'ff')) <> 0;
 --replace_result $1$aa$4OSUA5cjdx0RUQ08opV27/ aaqPiZY5xR5l.
-select password('test'),length(encrypt('test')),encrypt('test','aa');
+select old_password('test'), password('test');
+select length(encrypt('test')), encrypt('test','aa');

sql/item_create.cc

@@ -307,6 +307,11 @@ Item *create_func_quarter(Item* a)
   return new Item_func_quarter(a);
 }
 
+Item *create_func_password(Item* a)
+{
+  return new Item_func_password(a);
+}
+
 Item *create_func_radians(Item *a)
 {
   return new Item_func_units((char*) "radians",a,M_PI/180,0.0);

sql/item_create.h

@@ -70,6 +70,7 @@ Item *create_func_pi(void);
 Item *create_func_pow(Item* a, Item *b);
 Item *create_func_current_user(void);
 Item *create_func_quarter(Item* a);
+Item *create_func_password(Item* a);
 Item *create_func_radians(Item *a);
 Item *create_func_release_lock(Item* a);
 Item *create_func_repeat(Item* a, Item *b);

sql/lex.h

@@ -260,7 +260,6 @@ static SYMBOL symbols[] = {
   { "NULL",		SYM(NULL_SYM),0,0},
   { "NUMERIC",		SYM(NUMERIC_SYM),0,0},
   { "OFFSET",		SYM(OFFSET_SYM),0,0},
-  { "OLD_PASSWORD",	SYM(PASSWORD),0,0},
   { "ON",		SYM(ON),0,0},
   { "OPEN",		SYM(OPEN_SYM),0,0},
   { "OPTIMIZE",		SYM(OPTIMIZE),0,0},
@@ -475,6 +474,7 @@ static SYMBOL sql_functions[] = {
   { "NULLIF",		SYM(FUNC_ARG2),0,CREATE_FUNC(create_func_nullif)},
   { "OCTET_LENGTH",	SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_length)},
   { "OCT",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_oct)},
+  { "OLD_PASSWORD",     SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_password)},
   { "ORD",              SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ord)},
   { "PERIOD_ADD",	SYM(FUNC_ARG2),0,CREATE_FUNC(create_func_period_add)},
   { "PERIOD_DIFF",	SYM(FUNC_ARG2),0,CREATE_FUNC(create_func_period_diff)},

sql/opt_range.cc

@@ -23,8 +23,6 @@
 
 */
 
-
-
 #ifdef __GNUC__
 #pragma implementation				// gcc: Class implementation
 #endif

sql/opt_sum.cc

@@ -245,8 +245,15 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
 	const_result=0;
     }
   }
-  if (used_tables != removed_tables)
-    const_result=0;				// We didn't remove all tables
+  /*
+    If we have a where clause, we can only ignore searching in the
+    tables if MIN/MAX optimisation replaced all used tables
+    This is to not to use replaced values in case of:
+    SELECT MIN(key) FROM table_1, empty_table
+    removed_tables is != 0 if we have used MIN() or MAX().
+  */
+  if (removed_tables && used_tables != removed_tables)
+    const_result= 0;				// We didn't remove all tables
   return const_result;
 }