add option default-week-format and variable default_week_format

(SCRUM)

mysql-test/r/func_time.result

@@ -96,6 +96,11 @@ week(19981231,2)	week(19981231,3)	week(20000101,2)	week(20000101,3)
 select week(20001231,2),week(20001231,3);
 week(20001231,2)	week(20001231,3)
 1	52
+set default_week_format = 2;
+select week(20001231),week(20001231,2),week(20001231,0);
+week(20001231)	week(20001231,2)	week(20001231,0)
+1	1	53
+set default_week_format = 0;
 select date_format('1998-12-31','%x-%v'),date_format('1999-01-01','%x-%v');
 date_format('1998-12-31','%x-%v')	date_format('1999-01-01','%x-%v')
 1998-53	1998-53

mysql-test/t/func_time.test

@@ -41,6 +41,10 @@ select yearweek("2000-01-06",1) as '2000', yearweek("2001-01-06",1) as '2001', y
 select week(19981231,2), week(19981231,3), week(20000101,2), week(20000101,3);
 select week(20001231,2),week(20001231,3);
 
+set default_week_format = 2;
+select week(20001231),week(20001231,2),week(20001231,0);
+set default_week_format = 0;
+
 select date_format('1998-12-31','%x-%v'),date_format('1999-01-01','%x-%v');
 select date_format('1999-12-31','%x-%v'),date_format('2000-01-01','%x-%v');
 

sql/mysqld.cc

@@ -3465,7 +3465,8 @@ enum options
   OPT_ERROR_LOG_FILE,
   OPT_ENABLE_SHARED_MEMORY,
   OPT_SHARED_MEMORY_BASE_NAME,
-  OPT_OLD_PASSWORDS
+  OPT_OLD_PASSWORDS,
+  OPT_DEFAULT_WEEK_FORMAT
 };
 
 
@@ -4282,6 +4283,11 @@ struct my_option my_long_options[] =
    (gptr*) &global_system_variables.net_wait_timeout,
    (gptr*) &max_system_variables.net_wait_timeout, 0, GET_ULONG,
    REQUIRED_ARG, NET_WAIT_TIMEOUT, 1, LONG_TIMEOUT, 0, 1, 0},
+  { "default-week-format", OPT_DEFAULT_WEEK_FORMAT,
+    "The default week format used by WEEK() functions.",
+    (gptr*) &global_system_variables.default_week_format, 
+    (gptr*) &max_system_variables.default_week_format, 
+    0, GET_ULONG, REQUIRED_ARG, 0, 0, 3L, 0, 1, 0},
   {0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
 };
 

sql/set_var.cc

@@ -311,6 +311,8 @@ static sys_var_slave_skip_counter sys_slave_skip_counter("sql_slave_skip_counter
 static sys_var_rand_seed1	sys_rand_seed1("rand_seed1");
 static sys_var_rand_seed2	sys_rand_seed2("rand_seed2");
 
+static sys_var_thd_ulong        sys_default_week_format("default_week_format",
+					                &SV::default_week_format);
 
 /*
   List of all variables for initialisation and storage in hash
@@ -332,6 +334,7 @@ sys_var *sys_variables[]=
   &sys_concurrent_insert,
   &sys_connect_timeout,
   &sys_convert_charset,
+  &sys_default_week_format,
   &sys_delay_key_write,
   &sys_delayed_insert_limit,
   &sys_delayed_insert_timeout,
@@ -438,6 +441,7 @@ struct show_var_st init_vars[]= {
   {sys_connect_timeout.name,  (char*) &sys_connect_timeout,         SHOW_SYS},
   {sys_convert_charset.name,  (char*) &sys_convert_charset,	    SHOW_SYS},
   {"datadir",                 mysql_real_data_home,                 SHOW_CHAR},
+  {"default_week_format",     (char*) &sys_default_week_format,     SHOW_SYS},
   {sys_delay_key_write.name,  (char*) &sys_delay_key_write,         SHOW_SYS},
   {sys_delayed_insert_limit.name, (char*) &sys_delayed_insert_limit,SHOW_SYS},
   {sys_delayed_insert_timeout.name, (char*) &sys_delayed_insert_timeout, SHOW_SYS},

sql/sql_class.h

@@ -391,6 +391,7 @@ struct system_variables
   ulong tmp_table_size;
   ulong tx_isolation;
   ulong sql_mode;
+  ulong default_week_format;
 
   /*
     In slave thread we need to know in behalf of which

sql/sql_yacc.yy

@@ -2421,7 +2421,10 @@ simple_expr:
 	| USER '(' ')'
 	  { $$= new Item_func_user(); Lex->safe_to_cache_query=0; }
 	| WEEK_SYM '(' expr ')'
-	  { $$= new Item_func_week($3,new Item_int((char*) "0",0,1)); }
+	  { 
+            $$= new Item_func_week($3,new Item_int((char*) "0",
+				   YYTHD->variables.default_week_format,1)); 
+          }
 	| WEEK_SYM '(' expr ',' expr ')'
 	  { $$= new Item_func_week($3,$5); }
 	| YEAR_SYM '(' expr ')'