BUG#21173: SHOW TABLE STATUS crashes mysqld

Review fixes

mysql-test/r/partition.result

@@ -2,10 +2,28 @@ drop table if exists t1;
 create table t1 (a int)
 engine = innodb
 partition by key (a);
-insert into t1 values (0);
 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	InnoDB	10	Compact	2	8192	16384	0	0	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL	partitioned	
+insert into t1 values (0), (1), (2), (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	InnoDB	10	Compact	4	4096	16384	0	0	0	NULL	NULL	NULL	NULL	latin1_swedish_ci	NULL	partitioned	
+drop table t1;
+create table t1 (a int auto_increment primary key)
+engine = innodb
+partition by key (a);
+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	InnoDB	10	Compact	2	8192	16384	0	0	0	1	NULL	NULL	NULL	latin1_swedish_ci	NULL	partitioned	
+insert into t1 values (NULL), (NULL), (NULL), (NULL);
+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	InnoDB	10	Compact	4	4096	16384	0	0	0	5	NULL	NULL	NULL	latin1_swedish_ci	NULL	partitioned	
+insert into t1 values (NULL), (NULL), (NULL), (NULL);
+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	InnoDB	10	Compact	8	2048	16384	0	0	0	9	NULL	NULL	NULL	latin1_swedish_ci	NULL	partitioned	
 drop table t1;
 create table t1 (a int)
 partition by list (a)

mysql-test/t/partition.test

@@ -15,10 +15,20 @@ drop table if exists t1;
 create table t1 (a int)
 engine = innodb
 partition by key (a);
-insert into t1 values (0);
+show table status;
+insert into t1 values (0), (1), (2), (3);
 show table status;
 drop table t1;
 
+create table t1 (a int auto_increment primary key)
+engine = innodb
+partition by key (a);
+show table status;
+insert into t1 values (NULL), (NULL), (NULL), (NULL);
+show table status;
+insert into t1 values (NULL), (NULL), (NULL), (NULL);
+show table status;
+drop table t1;
 #
 # Bug 19309 Partitions: Crash if double procedural alter
 #

sql/ha_partition.cc

@@ -4186,12 +4186,16 @@ void ha_partition::info(uint flag)
 
     if (table->found_next_number_field)
     {
+      /*
+        Can only call get_auto_increment for tables that actually
+        have auto_increment columns, otherwise there will be
+        problems in handlers that don't expect get_auto_increment
+        for non-autoincrement tables.
+      */
       get_auto_increment(0, 0, 0, &stats.auto_increment_value,
                          &nb_reserved_values);
       release_auto_increment();
     }
-    else
-      stats.auto_increment_value= ~(ulonglong)(0);
   }
   if (flag & HA_STATUS_VARIABLE)
   {