Bug#27747 database metadata doesn't return sufficient column default info

added get_field_default_value() function which obtains default value from the field
(used in store_create_info() & get_schema_column_record() functions)

mysql-test/r/alter_table.result

@@ -54,7 +54,7 @@ SHOW FULL COLUMNS FROM t1;
 Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
 GROUP_ID	int(10) unsigned	NULL	NO	PRI	0		#	
 LANG_ID	smallint(5) unsigned	NULL	NO	PRI	0		#	
-NAME	char(80)	latin1_swedish_ci	NO	MUL			#	
+NAME	char(80)	latin1_swedish_ci	NO	MUL	NULL		#	
 DROP TABLE t1;
 create table t1 (n int);
 insert into t1 values(9),(3),(12),(10);

mysql-test/r/create.result

@@ -430,7 +430,7 @@ d	date	YES		NULL
 e	varchar(1)	NO			
 f	datetime	YES		NULL	
 g	time	YES		NULL	
-h	longblob	NO			
+h	longblob	NO		NULL	
 dd	time	YES		NULL	
 select * from t2;
 a	b	c	d	e	f	g	h	dd

mysql-test/r/ctype_collate.result

@@ -488,7 +488,7 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 SHOW FIELDS FROM  t1;
 Field	Type	Null	Key	Default	Extra
-latin1_f	char(32)	NO			
+latin1_f	char(32)	NO		NULL	
 ALTER TABLE t1 CHANGE latin1_f 
 latin1_f CHAR(32) CHARACTER SET latin1 COLLATE latin1_bin;
 SHOW CREATE TABLE t1;

mysql-test/r/ctype_recoding.result

@@ -54,7 +54,7 @@ Table	Create Table
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT=' '
 SHOW FIELDS FROM ;
 Field	Type	Null	Key	Default	Extra
-	char(32)	NO			
+	char(32)	NO		NULL	
 SET CHARACTER SET cp1251;
 SHOW TABLES;
 Tables_in_test
@@ -66,7 +66,7 @@ Table	Create Table
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT=' '
 SHOW FIELDS FROM ;
 Field	Type	Null	Key	Default	Extra
-	char(32)	NO			
+	char(32)	NO		NULL	
 SET CHARACTER SET utf8;
 SHOW TABLES;
 Tables_in_test
@@ -78,7 +78,7 @@ Table	Create Table
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='комментарий таблицы'
 SHOW FIELDS FROM таблица;
 Field	Type	Null	Key	Default	Extra
-поле	char(32)	NO			
+поле	char(32)	NO		NULL	
 SET CHARACTER SET koi8r;
 DROP TABLE ;
 SET CHARACTER SET default;

mysql-test/r/default.result

@@ -115,7 +115,7 @@ Warning	1364	Field 'd' doesn't have a default value
 desc bug20691;
 Field	Type	Null	Key	Default	Extra
 i	int(11)	YES		NULL	
-d	datetime	NO			
+d	datetime	NO		NULL	
 dn	datetime	NO		0000-00-00 00:00:00	
 insert into bug20691 values (3, DEFAULT, DEFAULT), (3, '1975-07-10 07:10:03', '1978-01-13 14:08:51'), (3, DEFAULT, DEFAULT);
 Warnings:

mysql-test/r/gis.result

@@ -9,35 +9,35 @@ CREATE TABLE gis_geometrycollection  (fid INTEGER NOT NULL PRIMARY KEY, g GEOMET
 CREATE TABLE gis_geometry (fid INTEGER NOT NULL PRIMARY KEY, g GEOMETRY);
 SHOW FIELDS FROM gis_point;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	point	YES		NULL	
 SHOW FIELDS FROM gis_line;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	linestring	YES		NULL	
 SHOW FIELDS FROM gis_polygon;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	polygon	YES		NULL	
 SHOW FIELDS FROM gis_multi_point;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	multipoint	YES		NULL	
 SHOW FIELDS FROM gis_multi_line;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	multilinestring	YES		NULL	
 SHOW FIELDS FROM gis_multi_polygon;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	multipolygon	YES		NULL	
 SHOW FIELDS FROM gis_geometrycollection;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	geometrycollection	YES		NULL	
 SHOW FIELDS FROM gis_geometry;
 Field	Type	Null	Key	Default	Extra
-fid	int(11)	NO	PRI		
+fid	int(11)	NO	PRI	NULL	
 g	geometry	YES		NULL	
 INSERT INTO gis_point VALUES 
 (101, PointFromText('POINT(10 10)')),
@@ -430,7 +430,7 @@ mln	multilinestring	YES		NULL
 mpg	multipolygon	YES		NULL	
 gc	geometrycollection	YES		NULL	
 gm	geometry	YES		NULL	
-fid	int(11)	NO			
+fid	int(11)	NO		NULL	
 DROP TABLE t1;
 SELECT AsText(GeometryFromWKB(AsWKB(GeometryFromText('POINT(1 4)'))));
 AsText(GeometryFromWKB(AsWKB(GeometryFromText('POINT(1 4)'))))

mysql-test/r/grant.result

@@ -526,7 +526,7 @@ Db	char(64)	NO	PRI
 User	char(16)	NO	PRI		
 Table_name	char(64)	NO	PRI		
 Grantor	char(77)	NO	MUL		
-Timestamp	timestamp	NO		CURRENT_TIMESTAMP	
+Timestamp	timestamp	NO		0000-00-00 00:00:00	
 Table_priv	set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter','Create View','Show view')	NO			
 Column_priv	set('Select','Insert','Update','References')	NO			
 use test;

mysql-test/r/information_schema.result

@@ -989,7 +989,7 @@ b	NULL
 use test;
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO			
+a	int(11)	NO		NULL	
 b	int(11)	YES		NULL	
 drop table t1;
 CREATE TABLE t1 (a int);
@@ -1354,4 +1354,35 @@ where event_object_table='t1';
 trigger_name
 drop user mysqltest_1@localhost;
 drop database mysqltest;
+create table t1 (
+f1 varchar(50),
+f2 varchar(50) not null,
+f3 varchar(50) default '',
+f4 varchar(50) default NULL,
+f5 bigint not null,
+f6 bigint not null default 10,
+f7 datetime not null,
+f8 datetime default '2006-01-01'
+);
+select column_default from information_schema.columns where table_name= 't1';
+column_default
+NULL
+NULL
+
+NULL
+NULL
+10
+NULL
+2006-01-01 00:00:00
+show columns from t1;
+Field	Type	Null	Key	Default	Extra
+f1	varchar(50)	YES		NULL	
+f2	varchar(50)	NO		NULL	
+f3	varchar(50)	YES			
+f4	varchar(50)	YES		NULL	
+f5	bigint(20)	NO		NULL	
+f6	bigint(20)	NO		10	
+f7	datetime	NO		NULL	
+f8	datetime	YES		2006-01-01 00:00:00	
+drop table t1;
 End of 5.0 tests.

mysql-test/r/key.result

@@ -336,8 +336,8 @@ UNIQUE i1idx (i1),
 UNIQUE i2idx (i2));
 desc t1;
 Field	Type	Null	Key	Default	Extra
-i1	int(11)	NO	PRI		
-i2	int(11)	NO	UNI		
+i1	int(11)	NO	PRI	NULL	
+i2	int(11)	NO	UNI	NULL	
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
@@ -392,27 +392,27 @@ drop table t1;
 create table t1 (a int not null primary key, b varchar(20) not null unique);
 desc t1;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
-b	varchar(20)	NO	UNI		
+a	int(11)	NO	PRI	NULL	
+b	varchar(20)	NO	UNI	NULL	
 drop table t1;
 create table t1 (a int not null primary key, b int not null unique);
 desc t1;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
-b	int(11)	NO	UNI		
+a	int(11)	NO	PRI	NULL	
+b	int(11)	NO	UNI	NULL	
 drop table t1;
 create table t1 (a int not null primary key, b varchar(20) not null, unique (b(10)));
 desc t1;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
-b	varchar(20)	NO	UNI		
+a	int(11)	NO	PRI	NULL	
+b	varchar(20)	NO	UNI	NULL	
 drop table t1;
 create table t1 (a int not null primary key, b varchar(20) not null, c varchar(20) not null, unique(b(10),c(10)));
 desc t1;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
-b	varchar(20)	NO	MUL		
-c	varchar(20)	NO			
+a	int(11)	NO	PRI	NULL	
+b	varchar(20)	NO	MUL	NULL	
+c	varchar(20)	NO		NULL	
 drop table t1;
 CREATE TABLE t1 (
 a INTEGER auto_increment PRIMARY KEY,

mysql-test/r/mysql.result

@@ -91,7 +91,7 @@ i	j	k
 NULL	1	NULL
 Field	Type	Null	Key	Default	Extra
 i	int(11)	YES		NULL	
-j	int(11)	NO			
+j	int(11)	NO		NULL	
 k	int(11)	YES		NULL	
 +------+---+------+
 | i    | j | k    |
@@ -102,7 +102,7 @@ k	int(11)	YES		NULL
 | Field | Type    | Null | Key | Default | Extra |
 +-------+---------+------+-----+---------+-------+
 | i     | int(11) | YES  |     | NULL    |       | 
-| j     | int(11) | NO   |     |         |       | 
+| j     | int(11) | NO   |     | NULL    |       | 
 | k     | int(11) | YES  |     | NULL    |       | 
 +-------+---------+------+-----+---------+-------+
 i	s1

mysql-test/r/ps_1general.result

@@ -269,7 +269,7 @@ prepare stmt4 from ' show columns from t2 where field in (select ?) ';
 SET @arg00="a";
 execute stmt4 using @arg00;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
+a	int(11)	NO	PRI	NULL	
 SET @arg00="b";
 execute stmt4 using @arg00;
 Field	Type	Null	Key	Default	Extra
@@ -280,7 +280,7 @@ Field	Type	Null	Key	Default	Extra
 prepare stmt4 from ' show columns from t2 from test like ''a%'' ';
 execute stmt4;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
+a	int(11)	NO	PRI	NULL	
 create index t2_idx on t2(b);
 prepare stmt4 from ' show index from t2 from test ';
 execute stmt4;
@@ -409,7 +409,7 @@ drop database mysqltest ;
 prepare stmt3 from ' describe t2 ';
 execute stmt3;
 Field	Type	Null	Key	Default	Extra
-a	int(11)	NO	PRI		
+a	int(11)	NO	PRI	NULL	
 b	char(10)	YES	MUL	NULL	
 drop table t2 ;
 execute stmt3;

mysql-test/r/show_check.result

@@ -228,7 +228,7 @@ show full columns from t1;
 Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
 test_set	set('val1','val2','val3')	latin1_swedish_ci	NO				select,insert,update,references	
 name	char(20)	latin1_swedish_ci	YES		O'Brien		select,insert,update,references	O'Brien as default
-c	int(11)	NULL	NO				select,insert,update,references	int column
+c	int(11)	NULL	NO		NULL		select,insert,update,references	int column
 c-b	int(11)	NULL	YES		NULL		select,insert,update,references	name with a minus
 space 2	int(11)	NULL	YES		NULL		select,insert,update,references	name with a space
 drop table t1;
@@ -901,7 +901,7 @@ def			COLUMNS	COLUMN_KEY	Key	253	9	3	N	1	0	33
 def			COLUMNS	COLUMN_DEFAULT	Default	252	589815	0	Y	16	0	33
 def			COLUMNS	EXTRA	Extra	253	60	0	N	1	0	33
 Field	Type	Null	Key	Default	Extra
-c	int(11)	NO	PRI		
+c	int(11)	NO	PRI	NULL	
 ----------------------------------------------------------------
 SHOW TRIGGERS LIKE 't1';
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr

mysql-test/r/sp.result

@@ -2468,7 +2468,7 @@ Database (foo)
 Level	Code	Message
 Field	Type	Null	Key	Default	Extra
 id	char(16)	NO			
-data	int(11)	NO			
+data	int(11)	NO		NULL	
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 Database	Table	In_use	Name_locked
 Privilege	Context	Comment
@@ -2520,7 +2520,7 @@ Database (foo)
 Level	Code	Message
 Field	Type	Null	Key	Default	Extra
 id	char(16)	NO			
-data	int(11)	NO			
+data	int(11)	NO		NULL	
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 Database	Table	In_use	Name_locked
 Privilege	Context	Comment

mysql-test/r/type_enum.result

@@ -1675,7 +1675,7 @@ t1	CREATE TABLE `t1` (
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
 a	int(11)	YES		1	
-b	enum('value','_value','')	NO			
+b	enum('value','_value','')	NO		NULL	
 drop table t1;
 CREATE TABLE t1 (c enum('a', 'A') BINARY);
 INSERT INTO t1 VALUES ('a'),('A');

mysql-test/r/type_ranges.result

@@ -63,9 +63,9 @@ time_field	time	NULL	YES		NULL		#
 date_time	datetime	NULL	YES		NULL		#	
 blob_col	blob	NULL	YES		NULL		#	
 tinyblob_col	tinyblob	NULL	YES		NULL		#	
-mediumblob_col	mediumblob	NULL	NO				#	
-longblob_col	longblob	NULL	NO				#	
-options	enum('one','two','tree')	latin1_swedish_ci	NO	MUL			#	
+mediumblob_col	mediumblob	NULL	NO		NULL		#	
+longblob_col	longblob	NULL	NO		NULL		#	
+options	enum('one','two','tree')	latin1_swedish_ci	NO	MUL	NULL		#	
 flags	set('one','two','tree')	latin1_swedish_ci	NO				#	
 show keys from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
@@ -214,7 +214,7 @@ Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
 auto	int(5) unsigned	NULL	NO	MUL	NULL	auto_increment	#	
 string	char(10)	latin1_swedish_ci	YES		newdefault		#	
 tiny	tinyint(4)	NULL	NO	MUL	0		#	
-short	smallint(6)	NULL	NO	MUL			#	
+short	smallint(6)	NULL	NO	MUL	NULL		#	
 medium	mediumint(8)	NULL	NO	MUL	0		#	
 long_int	int(11)	NULL	NO		0		#	
 longlong	bigint(13)	NULL	NO	MUL	0		#	
@@ -231,8 +231,8 @@ time_field	time	NULL	YES		NULL		#
 date_time	datetime	NULL	YES		NULL		#	
 new_blob_col	varchar(20)	latin1_swedish_ci	YES		NULL		#	
 tinyblob_col	tinyblob	NULL	YES		NULL		#	
-mediumblob_col	mediumblob	NULL	NO				#	
-options	enum('one','two','tree')	latin1_swedish_ci	NO	MUL			#	
+mediumblob_col	mediumblob	NULL	NO		NULL		#	
+options	enum('one','two','tree')	latin1_swedish_ci	NO	MUL	NULL		#	
 flags	set('one','two','tree')	latin1_swedish_ci	NO				#	
 new_field	char(10)	latin1_swedish_ci	NO		new		#	
 show full columns from t2;
@@ -240,7 +240,7 @@ Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
 auto	int(5) unsigned	NULL	NO		0		#	
 string	char(10)	latin1_swedish_ci	YES		newdefault		#	
 tiny	tinyint(4)	NULL	NO		0		#	
-short	smallint(6)	NULL	NO				#	
+short	smallint(6)	NULL	NO		NULL		#	
 medium	mediumint(8)	NULL	NO		0		#	
 long_int	int(11)	NULL	NO		0		#	
 longlong	bigint(13)	NULL	NO		0		#	
@@ -257,8 +257,8 @@ time_field	time	NULL	YES		NULL		#
 date_time	datetime	NULL	YES		NULL		#	
 new_blob_col	varchar(20)	latin1_swedish_ci	YES		NULL		#	
 tinyblob_col	tinyblob	NULL	YES		NULL		#	
-mediumblob_col	mediumblob	NULL	NO				#	
-options	enum('one','two','tree')	latin1_swedish_ci	NO				#	
+mediumblob_col	mediumblob	NULL	NO		NULL		#	
+options	enum('one','two','tree')	latin1_swedish_ci	NO		NULL		#	
 flags	set('one','two','tree')	latin1_swedish_ci	NO				#	
 new_field	char(10)	latin1_swedish_ci	NO		new		#	
 select t1.auto,t2.auto from t1,t2 where t1.auto=t2.auto and ((t1.string<>t2.string and (t1.string is not null or t2.string is not null)) or (t1.tiny<>t2.tiny and (t1.tiny is not null or t2.tiny is not null)) or (t1.short<>t2.short and (t1.short is not null or t2.short is not null)) or (t1.medium<>t2.medium and (t1.medium is not null or t2.medium is not null)) or (t1.long_int<>t2.long_int and (t1.long_int is not null or t2.long_int is not null)) or (t1.longlong<>t2.longlong and (t1.longlong is not null or t2.longlong is not null)) or (t1.real_float<>t2.real_float and (t1.real_float is not null or t2.real_float is not null)) or (t1.real_double<>t2.real_double and (t1.real_double is not null or t2.real_double is not null)) or (t1.utiny<>t2.utiny and (t1.utiny is not null or t2.utiny is not null)) or (t1.ushort<>t2.ushort and (t1.ushort is not null or t2.ushort is not null)) or (t1.umedium<>t2.umedium and (t1.umedium is not null or t2.umedium is not null)) or (t1.ulong<>t2.ulong and (t1.ulong is not null or t2.ulong is not null)) or (t1.ulonglong<>t2.ulonglong and (t1.ulonglong is not null or t2.ulonglong is not null)) or (t1.time_stamp<>t2.time_stamp and (t1.time_stamp is not null or t2.time_stamp is not null)) or (t1.date_field<>t2.date_field and (t1.date_field is not null or t2.date_field is not null)) or (t1.time_field<>t2.time_field and (t1.time_field is not null or t2.time_field is not null)) or (t1.date_time<>t2.date_time and (t1.date_time is not null or t2.date_time is not null)) or (t1.new_blob_col<>t2.new_blob_col and (t1.new_blob_col is not null or t2.new_blob_col is not null)) or (t1.tinyblob_col<>t2.tinyblob_col and (t1.tinyblob_col is not null or t2.tinyblob_col is not null)) or (t1.mediumblob_col<>t2.mediumblob_col and (t1.mediumblob_col is not null or t2.mediumblob_col is not null)) or (t1.options<>t2.options and (t1.options is not null or t2.options is not null)) or (t1.flags<>t2.flags and (t1.flags is not null or t2.flags is not null)) or (t1.new_field<>t2.new_field and (t1.new_field is not null or t2.new_field is not null)));
@@ -276,8 +276,8 @@ t1	int(1)	NULL	NO		0		#
 t2	varchar(1)	latin1_swedish_ci	NO				#	
 t3	varchar(256)	latin1_swedish_ci	NO				#	
 t4	varbinary(256)	NULL	NO				#	
-t5	longtext	latin1_swedish_ci	NO				#	
-t6	longblob	NULL	NO				#	
+t5	longtext	latin1_swedish_ci	NO		NULL		#	
+t6	longblob	NULL	NO		NULL		#	
 t7	char(0)	latin1_swedish_ci	NO				#	
 t8	binary(0)	NULL	NO				#	
 select t1,t2,length(t3),length(t4),length(t5),length(t6),t7,t8 from t2;

mysql-test/t/information_schema.test

@@ -1071,4 +1071,21 @@ connection default;
 drop user mysqltest_1@localhost;
 drop database mysqltest;
 
+#
+# Bug#27747 database metadata doesn't return sufficient column default info
+#
+create table t1 (
+  f1 varchar(50),
+  f2 varchar(50) not null,
+  f3 varchar(50) default '',
+  f4 varchar(50) default NULL,
+  f5 bigint not null,
+  f6 bigint not null default 10,
+  f7 datetime not null,
+  f8 datetime default '2006-01-01'
+);
+select column_default from information_schema.columns where table_name= 't1';
+show columns from t1;
+drop table t1;
+
 --echo End of 5.0 tests.

sql/sql_show.cc

@@ -791,13 +791,70 @@ static void append_directory(THD *thd, String *packet, const char *dir_type,
 
 #define LIST_PROCESS_HOST_LEN 64
 
+
+static bool get_field_default_value(THD *thd, TABLE *table,
+                                    Field *field, String *def_value,
+                                    bool quoted)
+{
+  bool has_default;
+  bool has_now_default;
+
+  /* 
+     We are using CURRENT_TIMESTAMP instead of NOW because it is
+     more standard
+  */
+  has_now_default= table->timestamp_field == field && 
+    field->unireg_check != Field::TIMESTAMP_UN_FIELD;
+    
+  has_default= (field->type() != FIELD_TYPE_BLOB &&
+                !(field->flags & NO_DEFAULT_VALUE_FLAG) &&
+                field->unireg_check != Field::NEXT_NUMBER &&
+                !((thd->variables.sql_mode & (MODE_MYSQL323 | MODE_MYSQL40))
+                  && has_now_default));
+
+  def_value->length(0);
+  if (has_default)
+  {
+    if (has_now_default)
+      def_value->append(STRING_WITH_LEN("CURRENT_TIMESTAMP"));
+    else if (!field->is_null())
+    {                                             // Not null by default
+      char tmp[MAX_FIELD_WIDTH];
+      String type(tmp, sizeof(tmp), field->charset());
+      field->val_str(&type);
+      if (type.length())
+      {
+        String def_val;
+        uint dummy_errors;
+        /* convert to system_charset_info == utf8 */
+        def_val.copy(type.ptr(), type.length(), field->charset(),
+                     system_charset_info, &dummy_errors);
+        if (quoted)
+          append_unescaped(def_value, def_val.ptr(), def_val.length());
+        else
+          def_value->append(def_val.ptr(), def_val.length());
+      }
+      else if (quoted)
+        def_value->append(STRING_WITH_LEN("''"));
+    }
+    else if (field->maybe_null() && quoted)
+      def_value->append(STRING_WITH_LEN("NULL"));    // Null as default
+    else
+      return 0;
+
+  }
+  return has_default;
+}
+
+
 static int
 store_create_info(THD *thd, TABLE_LIST *table_list, String *packet)
 {
   List<Item> field_list;
-  char tmp[MAX_FIELD_WIDTH], *for_str, buff[128];
+  char tmp[MAX_FIELD_WIDTH], *for_str, buff[128], def_value_buf[MAX_FIELD_WIDTH];
   const char *alias;
   String type(tmp, sizeof(tmp), system_charset_info);
+  String def_value(def_value_buf, sizeof(def_value_buf), system_charset_info);
   Field **ptr,*field;
   uint primary_key;
   KEY *key_info;
@@ -833,8 +890,6 @@ store_create_info(THD *thd, TABLE_LIST *table_list, String *packet)
 
   for (ptr=table->field ; (field= *ptr); ptr++)
   {
-    bool has_default;
-    bool has_now_default;
     uint flags = field->flags;
 
     if (ptr != table->field)
@@ -882,44 +937,10 @@ store_create_info(THD *thd, TABLE_LIST *table_list, String *packet)
       packet->append(STRING_WITH_LEN(" NULL"));
     }
 
-    /* 
-      Again we are using CURRENT_TIMESTAMP instead of NOW because it is
-      more standard 
-    */
-    has_now_default= table->timestamp_field == field && 
-                     field->unireg_check != Field::TIMESTAMP_UN_FIELD;
-    
-    has_default= (field->type() != FIELD_TYPE_BLOB &&
-                  !(field->flags & NO_DEFAULT_VALUE_FLAG) &&
-		  field->unireg_check != Field::NEXT_NUMBER &&
-                  !((thd->variables.sql_mode & (MODE_MYSQL323 | MODE_MYSQL40))
-		    && has_now_default));
-
-    if (has_default)
+    if (get_field_default_value(thd, table, field, &def_value, 1))
     {
       packet->append(STRING_WITH_LEN(" default "));
-      if (has_now_default)
-        packet->append(STRING_WITH_LEN("CURRENT_TIMESTAMP"));
-      else if (!field->is_null())
-      {                                             // Not null by default
-        type.set(tmp, sizeof(tmp), field->charset());
-        field->val_str(&type);
-	if (type.length())
-	{
-	  String def_val;
-          uint dummy_errors;
-	  /* convert to system_charset_info == utf8 */
-	  def_val.copy(type.ptr(), type.length(), field->charset(),
-		       system_charset_info, &dummy_errors);
-          append_unescaped(packet, def_val.ptr(), def_val.length());
-	}
-        else
-	  packet->append(STRING_WITH_LEN("''"));
-      }
-      else if (field->maybe_null())
-        packet->append(STRING_WITH_LEN("NULL"));    // Null as default
-      else
-        packet->append(tmp);
+      packet->append(def_value.ptr(), def_value.length(), system_charset_info);
     }
 
     if (!limited_mysql_mode && table->timestamp_field == field && 
@@ -2664,7 +2685,6 @@ static int get_schema_column_record(THD *thd, TABLE_LIST *tables,
     bool is_blob;
     uint flags=field->flags;
     char tmp[MAX_FIELD_WIDTH];
-    char tmp1[MAX_FIELD_WIDTH];
     String type(tmp,sizeof(tmp), system_charset_info);
     char *end;
     int decimals, field_length;
@@ -2710,33 +2730,13 @@ static int get_schema_column_record(THD *thd, TABLE_LIST *tables,
     table->field[7]->store(type.ptr(),
                            (tmp_buff ? tmp_buff - type.ptr() :
                             type.length()), cs);
-    if (show_table->timestamp_field == field &&
-        field->unireg_check != Field::TIMESTAMP_UN_FIELD)
-    {
-      table->field[5]->store(STRING_WITH_LEN("CURRENT_TIMESTAMP"), cs);
-      table->field[5]->set_notnull();
-    }
-    else if (field->unireg_check != Field::NEXT_NUMBER &&
-             !field->is_null() &&
-             !(field->flags & NO_DEFAULT_VALUE_FLAG))
-    {
-      String def(tmp1,sizeof(tmp1), cs);
-      type.set(tmp, sizeof(tmp), field->charset());
-      field->val_str(&type);
-      uint dummy_errors;
-      def.copy(type.ptr(), type.length(), type.charset(), cs, &dummy_errors);
-      table->field[5]->store(def.ptr(), def.length(), def.charset());
-      table->field[5]->set_notnull();
-    }
-    else if (field->unireg_check == Field::NEXT_NUMBER ||
-             lex->orig_sql_command != SQLCOM_SHOW_FIELDS ||
-             field->maybe_null())
-      table->field[5]->set_null();                // Null as default
-    else
+
+    if (get_field_default_value(thd, show_table, field, &type, 0))
     {
-      table->field[5]->store("",0, cs);
+      table->field[5]->store(type.ptr(), type.length(), cs);
       table->field[5]->set_notnull();
     }
+
     pos=(byte*) ((flags & NOT_NULL_FLAG) ?  "NO" : "YES");
     table->field[6]->store((const char*) pos,
                            strlen((const char*) pos), cs);