--new option and local variable to optionally turn on

"very new functions" - for now 4.1-compatible TIMESTAMT format

mysql-test/r/type_timestamp.result

@@ -84,3 +84,23 @@ date	date_time	time_stamp
 2005-01-01	2005-01-01 00:00:00	20050101000000
 2030-01-01	2030-01-01 00:00:00	20300101000000
 drop table t1;
+show variables like 'new';
+Variable_name	Value
+new	OFF
+create table t1 (t2 timestamp(2), t4 timestamp(4), t6 timestamp(6),
+t8 timestamp(8), t10 timestamp(10), t12 timestamp(12),
+t14 timestamp(14));
+insert t1 values (0,0,0,0,0,0,0),
+("1997-12-31 23:47:59", "1997-12-31 23:47:59", "1997-12-31 23:47:59",
+"1997-12-31 23:47:59", "1997-12-31 23:47:59", "1997-12-31 23:47:59",
+"1997-12-31 23:47:59");
+select * from t1;
+t2	t4	t6	t8	t10	t12	t14
+00	0000	000000	00000000	0000000000	000000000000	00000000000000
+97	9712	971231	19971231	9712312347	971231234759	19971231234759
+set new=1;
+select * from t1;
+t2	t4	t6	t8	t10	t12	t14
+00	00-00	00-00-00	0000-00-00	00-00-00 00:00	00-00-00 00:00:00	0000-00-00 00:00:00
+97	97-12	97-12-31	1997-12-31	97-12-31 23:47	97-12-31 23:47:59	1997-12-31 23:47:59
+drop table t1;

mysql-test/t/type_timestamp.test

@@ -55,3 +55,17 @@ INSERT INTO t1 VALUES ("2030-01-01","2030-01-01 00:00:00",20300101000000);
 #INSERT INTO t1 VALUES ("2050-01-01","2050-01-01 00:00:00",20500101000000);
 SELECT * FROM t1;
 drop table t1;
+
+show variables like 'new';
+create table t1 (t2 timestamp(2), t4 timestamp(4), t6 timestamp(6),
+                 t8 timestamp(8), t10 timestamp(10), t12 timestamp(12),
+                 t14 timestamp(14));
+insert t1 values (0,0,0,0,0,0,0),
+("1997-12-31 23:47:59", "1997-12-31 23:47:59", "1997-12-31 23:47:59",
+"1997-12-31 23:47:59", "1997-12-31 23:47:59", "1997-12-31 23:47:59",
+"1997-12-31 23:47:59");
+select * from t1;
+set new=1;
+select * from t1;
+drop table t1;
+

sql/field.cc

@@ -2616,14 +2616,17 @@ String *Field_timestamp::val_str(String *val_buffer,
 				 String *val_ptr __attribute__((unused)))
 {
   uint pos;
+  int extra;
   int part_time;
   uint32 temp;
   time_t time_arg;
   struct tm *l_time;
   struct tm tm_tmp;
+  my_bool new_format= (current_thd->variables.new_mode),
+          full_year=(field_length == 8 || field_length == 14);
+  static const uint extras[]={0,1,2,2,4,5,5};
 
-  val_buffer->alloc(field_length+1);
-  char *to=(char*) val_buffer->ptr(),*end=to+field_length;
+  extra= new_format ? extras[field_length/2-1] : 0;
 
 #ifdef WORDS_BIGENDIAN
   if (table->db_low_byte_first)
@@ -2634,17 +2637,24 @@ String *Field_timestamp::val_str(String *val_buffer,
 
   if (temp == 0L)
   {				      /* Zero time is "000000" */
-    VOID(strfill(to,field_length,'0'));
-    val_buffer->length(field_length);
+    if (new_format)
+      val_buffer->copy("0000-00-00 00:00:00"+2*(1-full_year),
+                       field_length+extra);
+    else
+      val_buffer->copy("00000000000000", field_length);
     return val_buffer;
   }
   time_arg=(time_t) temp;
   localtime_r(&time_arg,&tm_tmp);
   l_time=&tm_tmp;
+
+  val_buffer->alloc(field_length+extra+1);
+  char *to=(char*) val_buffer->ptr(),*end=to+field_length+extra;
+
   for (pos=0; to < end ; pos++)
   {
     bool year_flag=0;
-    switch (dayord.pos[pos]) {
+    switch (pos) {
     case 0: part_time=l_time->tm_year % 100; year_flag=1; break;
     case 1: part_time=l_time->tm_mon+1; break;
     case 2: part_time=l_time->tm_mday; break;
@@ -2653,7 +2663,7 @@ String *Field_timestamp::val_str(String *val_buffer,
     case 5: part_time=l_time->tm_sec; break;
     default: part_time=0; break; /* purecov: deadcode */
     }
-    if (year_flag && (field_length == 8 || field_length == 14))
+    if (year_flag && full_year)
     {
       if (part_time < YY_PART_YEAR)
       {
@@ -2666,7 +2676,14 @@ String *Field_timestamp::val_str(String *val_buffer,
     }
     *to++=(char) ('0'+((uint) part_time/10));
     *to++=(char) ('0'+((uint) part_time % 10));
+    if (new_format)
+    {
+      static const char delim[6]="-- ::";
+      *to++=delim[pos];
+    }
   }
+  if (new_format)
+    to--;
   *to=0;					// Safeguard
   val_buffer->length((uint) (to-val_buffer->ptr()));
   return val_buffer;

sql/mysqld.cc

@@ -3423,8 +3423,10 @@ struct my_option my_long_options[] =
   {"safemalloc-mem-limit", OPT_SAFEMALLOC_MEM_LIMIT,
    "Simulate memory shortage when compiled with the --with-debug=full option",
    0, 0, 0, GET_ULL, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
-  {"new", 'n', "Use very new possible 'unsafe' functions", 0, 0, 0, GET_NO_ARG,
-   NO_ARG, 0, 0, 0, 0, 0, 0},
+  {"new", 'n', "Use very new possible 'unsafe' functions",
+   (gptr*) &global_system_variables.new_mode,
+   (gptr*) &max_system_variables.new_mode,
+   0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
 #ifdef NOT_YET
   {"no-mix-table-types", OPT_NO_MIX_TYPE, "Don't allow commands with uses two different table types",
    (gptr*) &opt_no_mix_types, (gptr*) &opt_no_mix_types, 0, GET_BOOL, NO_ARG,
@@ -4222,9 +4224,6 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
   case 'L':
     strmake(language, argument, sizeof(language)-1);
     break;
-  case 'n':
-    opt_specialflag|= SPECIAL_NEW_FUNC;
-    break;
   case 'o':
     protocol_version=PROTOCOL_VERSION-1;
     break;

sql/set_var.cc

@@ -179,6 +179,7 @@ sys_var_thd_ulong	sys_net_write_timeout("net_write_timeout",
 sys_var_thd_ulong	sys_net_retry_count("net_retry_count",
 					    &SV::net_retry_count,
 					    fix_net_retry_count);
+sys_var_thd_bool	sys_new_mode("new", &SV::new_mode);
 sys_var_thd_ulong	sys_read_buff_size("read_buffer_size",
 					   &SV::read_buff_size);
 sys_var_thd_ulong	sys_read_rnd_buff_size("read_rnd_buffer_size",
@@ -347,6 +348,7 @@ sys_var *sys_variables[]=
   &sys_net_retry_count,
   &sys_net_wait_timeout,
   &sys_net_write_timeout,
+  &sys_new_mode,
   &sys_query_cache_size,
 #ifdef HAVE_QUERY_CACHE
   &sys_query_cache_limit,
@@ -490,6 +492,7 @@ struct show_var_st init_vars[]= {
   {sys_net_read_timeout.name, (char*) &sys_net_read_timeout,        SHOW_SYS},
   {sys_net_retry_count.name,  (char*) &sys_net_retry_count,	    SHOW_SYS},
   {sys_net_write_timeout.name,(char*) &sys_net_write_timeout,       SHOW_SYS},
+  {sys_new_mode.name,         (char*) &sys_new_mode,                SHOW_SYS},
   {"open_files_limit",	      (char*) &open_files_limit,	    SHOW_LONG},
   {"pid_file",                (char*) pidfile_name,                 SHOW_CHAR},
   {"log_error",               (char*) log_error_file,               SHOW_CHAR},

sql/sql_class.h

@@ -311,6 +311,7 @@ struct system_variables
 
   my_bool log_warnings;
   my_bool low_priority_updates;
+  my_bool new_mode;
 
   CONVERT *convert_set;
 };

sql/unireg.h

@@ -82,7 +82,7 @@
 
 #define SPECIAL_USE_LOCKS	1		/* Lock used databases */
 #define SPECIAL_NO_NEW_FUNC	2		/* Skip new functions */
-#define SPECIAL_NEW_FUNC	4		/* New nonstandard functions */
+#define SPECIAL_SKIP_SHOW_DB    4               /* Don't allow 'show db' */
 #define SPECIAL_WAIT_IF_LOCKED	8		/* Wait if locked database */
 #define SPECIAL_SAME_DB_NAME   16		/* form name = file name */
 #define SPECIAL_ENGLISH        32		/* English error messages */
@@ -92,7 +92,6 @@
 #define SPECIAL_NO_HOST_CACHE	512		/* Don't cache hosts */
 #define SPECIAL_LONG_LOG_FORMAT 1024
 #define SPECIAL_SAFE_MODE	2048
-#define SPECIAL_SKIP_SHOW_DB	4096		/* Don't allow 'show db' */
 
 	/* Extern defines */
 #define store_record(A,B) bmove_allign((A)->record[B],(A)->record[0],(size_t) (A)->reclength)