BUG#11759349 - 51655: CREATE TABLE IN MEMORY ENGINE DOESN'T STORE

CREATE_TIME IN INFORMATION_SC

It was impossible to determine MEMORY table creation time,
since it wasn't stored/exposed.

With this patch creation time is saved and it is available via
I_S.TABLES.CREATE_TIME.

Note: it was decided that additional analysis is required before
implementing UPDATE_TIME. Thus this patch doesn't store UPDATE_TIME.

include/heap.h

@@ -50,6 +50,7 @@ typedef struct st_heapinfo		/* Struct from heap_info */
   uint reclength;			/* Length of one record */
   int errkey;
   ulonglong auto_increment;
+  time_t create_time;
 } HEAPINFO;
 
 
@@ -146,6 +147,7 @@ typedef struct st_heap_share
   uint open_count;
   uchar *del_link;			/* Link to next block with del. rec */
   char * name;			/* Name of "memory-file" */
+  time_t create_time;
 #ifdef THREAD
   THR_LOCK lock;
   pthread_mutex_t intern_lock;		/* Locking for use with _locking */

mysql-test/r/heap.result

@@ -715,8 +715,8 @@ create table t1 (c char(10)) engine=memory;
 create table t2 (c varchar(10)) engine=memory;
 show table status like 't_';
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	0	11	0	#	0	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	0	12	0	#	0	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	0	11	0	#	0	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	0	12	0	#	0	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 drop table t1, t2;
 CREATE TABLE t1(a VARCHAR(1), b VARCHAR(2), c VARCHAR(256),
 KEY(a), KEY(b), KEY(c)) ENGINE=MEMORY;

mysql-test/r/show_check.result

@@ -458,57 +458,57 @@ insert into t2 values (1),(2);
 insert into t3 values (1,1),(2,2);
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	2	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	2	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	2	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	2	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	2	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	2	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 insert into t1 values (3),(4);
 insert into t2 values (3),(4);
 insert into t3 values (3,3),(4,4);
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	4	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	4	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	4	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	4	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	4	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	4	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 insert into t1 values (5);
 insert into t2 values (5);
 insert into t3 values (5,5);
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	5	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	5	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	5	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	5	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	5	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	5	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 delete from t1 where a=3;
 delete from t2 where b=3;
 delete from t3 where a=3;
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	4	#	#	#	#	#	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	4	#	#	#	#	#	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	4	#	#	#	#	#	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	4	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	4	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	4	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 truncate table t1;
 truncate table t2;
 truncate table t3;
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	0	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	0	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	0	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	0	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	0	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	0	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 insert into t1 values (5);
 insert into t2 values (5);
 insert into t3 values (5,5);
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	1	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	1	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	1	#	#	#	#	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	1	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	1	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	1	#	#	#	#	0	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 delete from t1 where a=5;
 delete from t2 where b=5;
 delete from t3 where a=5;
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	MEMORY	10	Fixed	0	#	#	#	#	#	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t2	MEMORY	10	Fixed	0	#	#	#	#	#	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
-t3	MEMORY	10	Fixed	0	#	#	#	#	#	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL		
+t1	MEMORY	10	Fixed	0	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t2	MEMORY	10	Fixed	0	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
+t3	MEMORY	10	Fixed	0	#	#	#	#	#	NULL	#	NULL	NULL	latin1_swedish_ci	NULL		
 drop table t1, t2, t3;
 create database mysqltest;
 show create database mysqltest;
@@ -659,7 +659,7 @@ DROP TABLE t1;
 flush tables;
 SHOW TABLE STATUS like 't1';
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	NULL	NULL	NULL	NULL	#	#	#	#	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Incorrect information in file: './test/t1.frm'
+t1	NULL	NULL	NULL	NULL	#	#	#	#	NULL	NULL	#	NULL	NULL	NULL	NULL	NULL	Incorrect information in file: './test/t1.frm'
 Warnings:
 Warning	1033	Incorrect information in file: './test/t1.frm'
 show create table t1;

mysql-test/t/heap.test

@@ -454,7 +454,7 @@ drop table t1;
 #
 create table t1 (c char(10)) engine=memory;
 create table t2 (c varchar(10)) engine=memory;
---replace_column 8 #
+--replace_column 8 # 12 #
 show table status like 't_';
 drop table t1, t2;
 

mysql-test/t/show_check.test

@@ -230,7 +230,7 @@ DROP TABLE """a";
 #set names latin1;
 #create database `ä`;
 #create table `ä`.`ä` (a int) engine=heap;
-#--replace_column 7 # 8 # 9 #
+#--replace_column 7 # 8 # 9 # 12 #
 #show table status from `ä` LIKE 'ä';
 #drop database `ä`;
 
@@ -276,37 +276,37 @@ CREATE TABLE t3 (
 insert into t1 values (1),(2);
 insert into t2 values (1),(2);
 insert into t3 values (1,1),(2,2);
---replace_column 6 # 7 # 8 # 9 #
+--replace_column 6 # 7 # 8 # 9 # 12 #
 show table status;
 insert into t1 values (3),(4);
 insert into t2 values (3),(4);
 insert into t3 values (3,3),(4,4);
---replace_column 6 # 7 # 8 # 9 #
+--replace_column 6 # 7 # 8 # 9 # 12 #
 show table status;
 insert into t1 values (5);
 insert into t2 values (5);
 insert into t3 values (5,5);
---replace_column 6 # 7 # 8 # 9 #
+--replace_column 6 # 7 # 8 # 9 # 12 #
 show table status;
 delete from t1 where a=3;
 delete from t2 where b=3;
 delete from t3 where a=3;
---replace_column 6 # 7 # 8 # 9 # 10 #
+--replace_column 6 # 7 # 8 # 9 # 10 # 12 #
 show table status;
 truncate table t1;
 truncate table t2;
 truncate table t3;
---replace_column 6 # 7 # 8 # 9 #
+--replace_column 6 # 7 # 8 # 9 # 12 #
 show table status;
 insert into t1 values (5);
 insert into t2 values (5);
 insert into t3 values (5,5);
---replace_column 6 # 7 # 8 # 9 #
+--replace_column 6 # 7 # 8 # 9 # 12 #
 show table status;
 delete from t1 where a=5;
 delete from t2 where b=5;
 delete from t3 where a=5;
---replace_column 6 # 7 # 8 # 9 # 10 #
+--replace_column 6 # 7 # 8 # 9 # 10 # 12 #
 show table status;
 
 drop table t1, t2, t3;
@@ -367,7 +367,7 @@ flush privileges;
 #set names latin1;
 #create database `ä`;
 #create table `ä`.`ä` (a int) engine=heap;
-#--replace_column 7 # 8 # 9 #
+#--replace_column 7 # 8 # 9 # 12 #
 #show table status from `ä` LIKE 'ä';
 #drop database `ä`;
 
@@ -430,7 +430,7 @@ flush tables;
 # Create a junk frm file on disk
 let $MYSQLD_DATADIR= `select @@datadir`;
 system echo "this is a junk file for test" >> $MYSQLD_DATADIR/test/t1.frm ;
---replace_column 6 # 7 # 8 # 9 #
+--replace_column 6 # 7 # 8 # 9 # 12 #
 SHOW TABLE STATUS like 't1';
 --error ER_NOT_FORM_FILE
 show create table t1;

storage/heap/ha_heap.cc

@@ -382,6 +382,7 @@ int ha_heap::info(uint flag)
   stats.index_file_length=    hp_info.index_length;
   stats.max_data_file_length= hp_info.max_records * hp_info.reclength;
   stats.delete_length=        hp_info.deleted * hp_info.reclength;
+  stats.create_time=          (ulong) hp_info.create_time;
   if (flag & HA_STATUS_AUTO)
     stats.auto_increment_value= hp_info.auto_increment;
   /*

storage/heap/hp_create.c

@@ -186,6 +186,7 @@ int heap_create(const char *name, uint keys, HP_KEYDEF *keydef,
     share->auto_key= create_info->auto_key;
     share->auto_key_type= create_info->auto_key_type;
     share->auto_increment= create_info->auto_increment;
+    share->create_time= (long) time((time_t*) 0);
     /* Must be allocated separately for rename to work */
     if (!(share->name= my_strdup(name,MYF(0))))
     {

storage/heap/hp_info.c

@@ -53,6 +53,7 @@ int heap_info(reg1 HP_INFO *info,reg2 HEAPINFO *x, int flag )
   x->index_length    = info->s->index_length;
   x->max_records     = info->s->max_records;
   x->errkey          = info->errkey;
+  x->create_time     = info->s->create_time;
   if (flag & HA_STATUS_AUTO)
     x->auto_increment= info->s->auto_increment + 1;
   DBUG_RETURN(0);