branches/5.1: In the last round of AUTOINC cleanup we assumed that AUTOINC

is only defined for integer columns. This caused an assertion failure when
we checked for the maximum value of a column type. We now calculate the
max value for floating-point autoinc columns too.

Fix Bug#42400 - InnoDB autoinc code can't handle floating-point columns
rb://84 and Mantis issue://162

handler/ha_innodb.cc

@@ -3405,7 +3405,7 @@ build_template(
 }
 
 /************************************************************************
-Get the upper limit of the MySQL integral type. */
+Get the upper limit of the MySQL integral and floating-point type. */
 
 ulonglong
 ha_innobase::innobase_get_int_col_max_value(
@@ -3450,6 +3450,14 @@ ha_innobase::innobase_get_int_col_max_value(
 	case HA_KEYTYPE_LONGLONG:
 		max_value = 0x7FFFFFFFFFFFFFFFULL;
 		break;
+	case HA_KEYTYPE_FLOAT:
+		/* We use the maximum as per IEEE754-2008 standard, 2^24 */
+		max_value = 0x1000000;
+		break;
+	case HA_KEYTYPE_DOUBLE:
+		/* We use the maximum as per IEEE754-2008 standard, 2^53 */
+		max_value = 0x20000000000000;
+		break;
 	default:
 		ut_error;
 	}

mysql-test/innodb-autoinc.result

@@ -581,3 +581,51 @@ c1
 18446744073709551610
 18446744073709551615
 DROP TABLE t1;
+SET @@SESSION.AUTO_INCREMENT_INCREMENT=1, @@SESSION.AUTO_INCREMENT_OFFSET=1;
+SET @@INSERT_ID=1;
+SHOW VARIABLES LIKE "%auto_inc%";
+Variable_name	Value
+auto_increment_increment	1
+auto_increment_offset	1
+CREATE TABLE t1 (c1 DOUBLE NOT NULL AUTO_INCREMENT, c2 INT, PRIMARY KEY (c1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(NULL, 1);
+INSERT INTO t1 VALUES(NULL, 2);
+SELECT * FROM t1;
+c1	c2
+1	1
+2	2
+ALTER TABLE t1 CHANGE c1 c1 SERIAL;
+SELECT * FROM t1;
+c1	c2
+1	1
+2	2
+INSERT INTO t1 VALUES(NULL, 3);
+INSERT INTO t1 VALUES(NULL, 4);
+SELECT * FROM t1;
+c1	c2
+1	1
+2	2
+3	3
+4	4
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c1 FLOAT NOT NULL AUTO_INCREMENT, c2 INT, PRIMARY KEY (c1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(NULL, 1);
+INSERT INTO t1 VALUES(NULL, 2);
+SELECT * FROM t1;
+c1	c2
+1	1
+2	2
+ALTER TABLE t1 CHANGE c1 c1 SERIAL;
+SELECT * FROM t1;
+c1	c2
+1	1
+2	2
+INSERT INTO t1 VALUES(NULL, 3);
+INSERT INTO t1 VALUES(NULL, 4);
+SELECT * FROM t1;
+c1	c2
+1	1
+2	2
+3	3
+4	4
+DROP TABLE t1;

mysql-test/innodb-autoinc.test

@@ -371,3 +371,30 @@ SHOW VARIABLES LIKE "%auto_inc%";
 INSERT INTO t1 VALUES (NULL),(NULL), (NULL);
 SELECT * FROM t1;
 DROP TABLE t1;
+
+#
+# Check for floating point autoinc column handling
+#
+SET @@SESSION.AUTO_INCREMENT_INCREMENT=1, @@SESSION.AUTO_INCREMENT_OFFSET=1;
+SET @@INSERT_ID=1;
+SHOW VARIABLES LIKE "%auto_inc%";
+CREATE TABLE t1 (c1 DOUBLE NOT NULL AUTO_INCREMENT, c2 INT, PRIMARY KEY (c1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(NULL, 1);
+INSERT INTO t1 VALUES(NULL, 2);
+SELECT * FROM t1;
+ALTER TABLE t1 CHANGE c1 c1 SERIAL;
+SELECT * FROM t1;
+INSERT INTO t1 VALUES(NULL, 3);
+INSERT INTO t1 VALUES(NULL, 4);
+SELECT * FROM t1;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c1 FLOAT NOT NULL AUTO_INCREMENT, c2 INT, PRIMARY KEY (c1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(NULL, 1);
+INSERT INTO t1 VALUES(NULL, 2);
+SELECT * FROM t1;
+ALTER TABLE t1 CHANGE c1 c1 SERIAL;
+SELECT * FROM t1;
+INSERT INTO t1 VALUES(NULL, 3);
+INSERT INTO t1 VALUES(NULL, 4);
+SELECT * FROM t1;
+DROP TABLE t1;