Enable key lengths of up to 3K on 32-bit platforms.

mysql-test/r/bdb.result:
  Add new results
mysql-test/r/innodb.result:
  Add new results
mysql-test/t/bdb.test:
  Add simple test that large keys are allowed
mysql-test/t/innodb.test:
  Add simple test that large keys are allowed
sql/unireg.h:
  Allow key length of 3K even on 32-bit platforms

mysql-test/r/bdb.result

@@ -1891,3 +1891,17 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=BerkeleyDB DEFAULT CHARSET=latin1
 drop table t1;
 set storage_engine=MyISAM;
+create table t1 (a varchar(255) character set utf8,
+b varchar(255) character set utf8,
+c varchar(255) character set utf8,
+d varchar(255) character set utf8,
+key (a,b,c,d)) engine=bdb;
+drop table t1;
+create table t1 (a varchar(255) character set utf8,
+b varchar(255) character set utf8,
+c varchar(255) character set utf8,
+d varchar(255) character set utf8,
+e varchar(255) character set utf8,
+key (a,b,c,d,e)) engine=bdb;
+ERROR 42000: Specified key was too long; max key length is 3072 bytes
+End of 5.0 tests

mysql-test/r/innodb.result

@@ -2772,3 +2772,17 @@ insert into t2 values (4,_ucs2 0x05612020,_ucs2 0x05612020,'taken');
 drop table t1;
 drop table t2;
 commit;
+create table t1 (a varchar(255) character set utf8,
+b varchar(255) character set utf8,
+c varchar(255) character set utf8,
+d varchar(255) character set utf8,
+key (a,b,c,d)) engine=innodb;
+drop table t1;
+create table t1 (a varchar(255) character set utf8,
+b varchar(255) character set utf8,
+c varchar(255) character set utf8,
+d varchar(255) character set utf8,
+e varchar(255) character set utf8,
+key (a,b,c,d,e)) engine=innodb;
+ERROR 42000: Specified key was too long; max key length is 3072 bytes
+End of 5.0 tests

mysql-test/t/bdb.test

@@ -974,3 +974,22 @@ drop table t1;
 
 # End varchar test
 eval set storage_engine=$default;
+
+#
+# Test that we can create a large key
+#
+create table t1 (a varchar(255) character set utf8,
+                 b varchar(255) character set utf8,
+                 c varchar(255) character set utf8,
+                 d varchar(255) character set utf8,
+                 key (a,b,c,d)) engine=bdb;
+drop table t1;
+--error ER_TOO_LONG_KEY
+create table t1 (a varchar(255) character set utf8,
+                 b varchar(255) character set utf8,
+                 c varchar(255) character set utf8,
+                 d varchar(255) character set utf8,
+                 e varchar(255) character set utf8,
+                 key (a,b,c,d,e)) engine=bdb;
+
+--echo End of 5.0 tests

mysql-test/t/innodb.test

@@ -1751,3 +1751,22 @@ insert into t2 values (4,_ucs2 0x05612020,_ucs2 0x05612020,'taken');
 drop table t1;
 drop table t2;
 commit;
+
+#
+# Test that we can create a large (>1K) key
+#
+create table t1 (a varchar(255) character set utf8,
+                 b varchar(255) character set utf8,
+                 c varchar(255) character set utf8,
+                 d varchar(255) character set utf8,
+                 key (a,b,c,d)) engine=innodb;
+drop table t1;
+--error ER_TOO_LONG_KEY
+create table t1 (a varchar(255) character set utf8,
+                 b varchar(255) character set utf8,
+                 c varchar(255) character set utf8,
+                 d varchar(255) character set utf8,
+                 e varchar(255) character set utf8,
+                 key (a,b,c,d,e)) engine=innodb;
+
+--echo End of 5.0 tests

sql/unireg.h

@@ -50,11 +50,7 @@
 #define MAX_SYS_VAR_LENGTH 32
 #define MAX_KEY 64				/* Max used keys */
 #define MAX_REF_PARTS 16			/* Max parts used as ref */
-#if SIZEOF_CHARP > 4
-#define MAX_KEY_LENGTH 3072			/* max possible key, if 64 bits */
-#else
-#define MAX_KEY_LENGTH 1024			/* max possible key, if 32 bits */
-#endif
+#define MAX_KEY_LENGTH 3072			/* max possible key */
 #if SIZEOF_OFF_T > 4
 #define MAX_REFLENGTH 8				/* Max length for record ref */
 #else