Report the current value of the AUTO_INCREMENT counter to MySQL.

(Bug #23313, Bug #21404)

ha_innobase::update_create_info(): New function, to report
the auto_increment_value.

handler/ha_innodb.cc

@@ -4769,6 +4769,20 @@ create_clustered_index_when_no_primary(
 	return(error);
 }
 
+/*********************************************************************
+Update create_info.  Used in SHOW CREATE TABLE et al. */
+
+void
+ha_innobase::update_create_info(
+/*============================*/
+	HA_CREATE_INFO* create_info)	/* in/out: create info */
+{
+  if (!(create_info->used_fields & HA_CREATE_USED_AUTO)) {
+    ha_innobase::info(HA_STATUS_AUTO);
+    create_info->auto_increment_value = stats.auto_increment_value;
+  }
+}
+
 /*********************************************************************
 Creates a new table to an InnoDB database. */
 

handler/ha_innodb.h

@@ -150,6 +150,7 @@ class ha_innobase: public handler
 								*max_key);
 	ha_rows estimate_rows_upper_bound();
 
+	void update_create_info(HA_CREATE_INFO* create_info);
 	int create(const char *name, register TABLE *form,
 					HA_CREATE_INFO *create_info);
 	int delete_all_rows();

mysql-test/innodb.result

@@ -3159,6 +3159,31 @@ t2	CREATE TABLE `t2` (
   CONSTRAINT `t2_t1` FOREIGN KEY (`id`) REFERENCES `t1` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
 DROP TABLE t2, t1;
+CREATE TABLE t1 (id int PRIMARY KEY AUTO_INCREMENT) ENGINE=InnoDB
+AUTO_INCREMENT=42;
+INSERT INTO t1 VALUES (0),(347),(0);
+SELECT * FROM t1;
+id
+42
+347
+348
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB AUTO_INCREMENT=349 DEFAULT CHARSET=latin1
+CREATE TABLE t2 (id int PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t2 VALUES(42),(347),(348);
+ALTER TABLE t1 ADD CONSTRAINT t1_t2 FOREIGN KEY (id) REFERENCES t2(id);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  PRIMARY KEY (`id`),
+  CONSTRAINT `t1_t2` FOREIGN KEY (`id`) REFERENCES `t2` (`id`)
+) ENGINE=InnoDB AUTO_INCREMENT=349 DEFAULT CHARSET=latin1
+DROP TABLE t1,t2;
 CREATE TABLE t1 (a INT, INDEX(a)) ENGINE=InnoDB;
 CREATE TABLE t2 (a INT, INDEX(a)) ENGINE=InnoDB;
 INSERT INTO t1 VALUES (1);

mysql-test/innodb.test

@@ -2320,6 +2320,26 @@ INSERT INTO t1 VALUES ('DDD');
 SELECT * FROM t1;
 DROP TABLE t1;
 
+#
+# Bug #23313 (AUTO_INCREMENT=# not reported back for InnoDB tables)
+# Bug #21404 (AUTO_INCREMENT value reset when Adding FKEY (or ALTER?))
+#
+
+CREATE TABLE t1 (id int PRIMARY KEY AUTO_INCREMENT) ENGINE=InnoDB
+AUTO_INCREMENT=42;
+
+INSERT INTO t1 VALUES (0),(347),(0);
+SELECT * FROM t1;
+
+SHOW CREATE TABLE t1;
+
+CREATE TABLE t2 (id int PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t2 VALUES(42),(347),(348);
+ALTER TABLE t1 ADD CONSTRAINT t1_t2 FOREIGN KEY (id) REFERENCES t2(id);
+SHOW CREATE TABLE t1;
+
+DROP TABLE t1,t2;
+
 #######################################################################
 #                                                                     #
 # Please, DO NOT TOUCH this file as well as the innodb.result file.   #