WL#1175: more default_week_formats for iso compatibility

New formats added for 'week()' function and 'default_week_format' option(4 - 7).
Next formats is supported now:
*Value* *Meaning*
  `0'     Week starts on Sunday; First Sunday of the year starts week 1.
  	  Week() returns 0-53.
  `1'     Week starts on Monday; Weeks numbered according to ISO 8601:1988.
	  Week() returns 0-53.
  `2'     Week starts on Sunday; First Sunday of the year starts week 1.
  	  Week() returns 1-53.
  `3'     Week starts on Monday; Weeks numbered according to ISO 8601:1988.
	  Week() returns 1-53.
  `4'     Week starts on Sunday; Weeks numbered according to ISO 8601:1988.
	  Week() returns 0-53.
  `5'     Week starts on Monday;  First Monday of the year starts week 1.
  	  Week() returns 0-53.
  `6'     Week starts on Sunday; Weeks numbered according to ISO 8601:1988.
	  Week() returns 1-53.
  `7'     Week starts on Monday;  First Monday of the year starts week 1.
  	  Week() returns 1-53.


mysql-test/r/func_time.result:
  Test for 'default_week_format' option and 'week' function
mysql-test/t/func_time.test:
  Test for 'default_week_format' option and 'week' function
sql/item_timefunc.cc:
  WL#1175 more default_week_formats for iso compatibility
sql/mysql_priv.h:
  WL#1175 more default_week_formats for iso compatibility
sql/mysqld.cc:
  WL#1175 more default_week_formats for iso compatibility
sql/time.cc:
  WL#1175 more default_week_formats for iso compatibility

1 files changed, 6 insertions, 2 deletions

diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index adb7831896c..04529919990 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -247,6 +247,11 @@ void debug_sync_point(const char* lock_name, uint lock_timeout);
 #define tmp_file_prefix "#sql"			/* Prefix for tmp tables */
 #define tmp_file_prefix_length 4
 
+/* Flags for calc_week() function.  */
+#define WEEK_MONDAY_FIRST    1
+#define WEEK_YEAR            2
+#define WEEK_FIRST_WEEKDAY   4
+
 struct st_table;
 class THD;
 
@@ -806,8 +811,7 @@ ha_rows filesort(TABLE *form,struct st_sort_field *sortorder, uint s_length,
 void change_double_for_sort(double nr,byte *to);
 int get_quick_record(SQL_SELECT *select);
 int calc_weekday(long daynr,bool sunday_first_day_of_week);
-uint calc_week(TIME *ltime, bool with_year, bool sunday_first_day_of_week,
-	       uint *year);
+uint calc_week(TIME *l_time, uint week_behaviour, uint *year);
 void find_date(char *pos,uint *vek,uint flag);
 TYPELIB *convert_strings_to_array_type(my_string *typelibs, my_string *end);
 TYPELIB *typelib(List<String> &strings);