branches/5.1: Fix BUG#49032 - auto_increment field does not initialize to last...

branches/5.1: Fix BUG#49032 - auto_increment field does not initialize to last value in InnoDB Storage Engine.

We use the appropriate function to read the column value for non-integer
autoinc column types, namely float and double.

rb://208. Approved by Marko.

mysql-test/innodb-autoinc.result

@@ -1126,3 +1126,31 @@ SELECT * FROM T1;
 c1	c2
 10	0
 DROP TABLE T1;
+DROP TABLE IF EXISTS T1;
+Warnings:
+Note	1051	Unknown table 'T1'
+CREATE TABLE T1(C1 DOUBLE AUTO_INCREMENT KEY, C2 CHAR(10)) ENGINE=InnoDB;
+INSERT INTO T1(C1, C2) VALUES (1, 'innodb'), (3, 'innodb');
+INSERT INTO T1(C1) VALUES ('innodb');
+Warnings:
+Warning	1265	Data truncated for column 'C1' at row 1
+SHOW CREATE TABLE T1;
+Table	Create Table
+T1	CREATE TABLE `T1` (
+  `C1` double NOT NULL AUTO_INCREMENT,
+  `C2` char(10) DEFAULT NULL,
+  PRIMARY KEY (`C1`)
+) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1
+DROP TABLE T1;
+CREATE TABLE T1(C1 FLOAT AUTO_INCREMENT KEY, C2 CHAR(10)) ENGINE=InnoDB;
+INSERT INTO T1(C1, C2) VALUES (1, 'innodb'), (3, 'innodb');
+INSERT INTO T1(C1) VALUES ('innodb');
+Warnings:
+Warning	1265	Data truncated for column 'C1' at row 1
+SHOW CREATE TABLE T1;
+Table	Create Table
+T1	CREATE TABLE `T1` (
+  `C1` float NOT NULL AUTO_INCREMENT,
+  `C2` char(10) DEFAULT NULL,
+  PRIMARY KEY (`C1`)
+) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1

mysql-test/innodb-autoinc.test

@@ -620,3 +620,23 @@ SHOW CREATE TABLE T1;
 INSERT INTO T1 (c2) values (0);
 SELECT * FROM T1;
 DROP TABLE T1;
+
+##
+# 49032: Use the correct function to read the AUTOINC column value
+#
+DROP TABLE IF EXISTS T1;
+CREATE TABLE T1(C1 DOUBLE AUTO_INCREMENT KEY, C2 CHAR(10)) ENGINE=InnoDB;
+INSERT INTO T1(C1, C2) VALUES (1, 'innodb'), (3, 'innodb');
+# Restart the server
+-- source include/restart_mysqld.inc
+INSERT INTO T1(C1) VALUES ('innodb');
+SHOW CREATE TABLE T1;
+DROP TABLE T1;
+CREATE TABLE T1(C1 FLOAT AUTO_INCREMENT KEY, C2 CHAR(10)) ENGINE=InnoDB;
+INSERT INTO T1(C1, C2) VALUES (1, 'innodb'), (3, 'innodb');
+# Restart the server
+-- source include/restart_mysqld.inc
+INSERT INTO T1(C1) VALUES ('innodb');
+SHOW CREATE TABLE T1;
+
+

row/row0sel.c

@@ -4514,6 +4514,7 @@ row_search_autoinc_read_column(
 	dict_index_t*	index,		/* in: index to read from */
 	const rec_t*	rec,		/* in: current rec */
 	ulint		col_no,		/* in: column number */
+ 	ulint		mtype,		/*!< in: column main type */
 	ibool		unsigned_type)	/* in: signed or unsigned flag */
 {
 	ulint		len;
@@ -4537,7 +4538,22 @@ row_search_autoinc_read_column(
 	ut_a(len != UNIV_SQL_NULL);
 	ut_a(len <= sizeof value);
 
-	value = mach_read_int_type(data, len, unsigned_type);
+ 	switch (mtype) {
+ 	case DATA_INT:
+ 		value = mach_read_int_type(data, len, unsigned_type);
+ 		break;
+ 
+ 	case DATA_FLOAT:
+ 		value = mach_float_read(data);
+ 		break;
+ 
+ 	case DATA_DOUBLE:
+ 		value = mach_double_read(data);
+ 		break;
+ 
+	default:
+ 		ut_error;
+	}
 
 	if (UNIV_LIKELY_NULL(heap)) {
 		mem_heap_free(heap);
@@ -4625,7 +4641,8 @@ row_search_max_autoinc(
 					dfield->col->prtype & DATA_UNSIGNED);
 
 				*value = row_search_autoinc_read_column(
-					index, rec, i, unsigned_type);
+					index, rec, i,
+				       	dfield->col->mtype, unsigned_type);
 			}
 		}