MDEV-24610 MEMORY SE: check overflow in info calls with HA_STATUS_AUTO

mysql-test/suite/parts/r/mdev_24610.result

+CREATE TABLE t (c BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE=MEMORY PARTITION BY KEY();
+INSERT INTO t VALUES (18446744073709551615);
+select * from t;
+c
+18446744073709551615
+drop table t;
+CREATE TABLE t (c BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE=MEMORY;
+INSERT INTO t VALUES (18446744073709551615);
+ALTER TABLE t PARTITION BY KEY();
+INSERT INTO t VALUES (1);
+select * from t;
+c
+18446744073709551615
+1
+drop table t;
+CREATE TABLE t (c BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE=MEMORY;
+INSERT INTO t VALUES (18446744073709551615);
+ALTER TABLE t PARTITION BY KEY();
+INSERT INTO t VALUES (NULL);
+ERROR HY000: Failed to read auto-increment value from storage engine
+select * from t;
+c
+18446744073709551615
+drop table t;

mysql-test/suite/parts/t/mdev_24610.test

+--source include/have_innodb.inc
+--source include/have_partition.inc
+
+CREATE TABLE t (c BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE=MEMORY PARTITION BY KEY();
+INSERT INTO t VALUES (18446744073709551615);
+select * from t;
+drop table t;
+
+CREATE TABLE t (c BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE=MEMORY;
+INSERT INTO t VALUES (18446744073709551615);
+ALTER TABLE t PARTITION BY KEY();
+INSERT INTO t VALUES (1);
+select * from t;
+drop table t;
+
+CREATE TABLE t (c BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE=MEMORY;
+INSERT INTO t VALUES (18446744073709551615);
+ALTER TABLE t PARTITION BY KEY();
+--error ER_AUTOINC_READ_FAILED
+INSERT INTO t VALUES (NULL);
+select * from t;
+drop table t;

storage/heap/hp_info.c

@@ -40,6 +40,10 @@ int heap_info(reg1 HP_INFO *info,reg2 HEAPINFO *x, int flag )
   x->errkey          = info->errkey;
   x->create_time     = info->s->create_time;
   if (flag & HA_STATUS_AUTO)
-    x->auto_increment= info->s->auto_increment + 1;
+  {
+    x->auto_increment= info->s->auto_increment+1;
+    if (!x->auto_increment)			/* This shouldn't happen */
+      x->auto_increment= ~(ulonglong) 0;
+  }
   DBUG_RETURN(0);
 } /* heap_info */