Bug#10056 - PACK_KEYS option take values greater than 1 while creating table

Added a switch to reject illegal values for PACK_KEYS.

mysql-test/r/myisam.result

@@ -1274,3 +1274,9 @@ show keys from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	1	a	1	a	A	8	NULL	NULL	YES	BTREE	
 drop table t1;
+create table t1 (c1 int) engine=myisam pack_keys=0;
+create table t2 (c1 int) engine=myisam pack_keys=1;
+create table t3 (c1 int) engine=myisam pack_keys=default;
+create table t4 (c1 int) engine=myisam pack_keys=2;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '2' at line 1
+drop table t1, t2, t3;

mysql-test/t/myisam.test

@@ -675,4 +675,14 @@ show keys from t1;
 
 drop table t1;
 
+#
+# Bug#10056 - PACK_KEYS option take values greater than 1 while creating table
+#
+create table t1 (c1 int) engine=myisam pack_keys=0;
+create table t2 (c1 int) engine=myisam pack_keys=1;
+create table t3 (c1 int) engine=myisam pack_keys=default;
+--error 1064
+create table t4 (c1 int) engine=myisam pack_keys=2;
+drop table t1, t2, t3;
+
 # End of 4.1 tests

sql/sql_yacc.yy

@@ -2661,8 +2661,27 @@ create_table_option:
 	| PASSWORD opt_equal TEXT_STRING_sys	{ Lex->create_info.password=$3.str; Lex->create_info.used_fields|= HA_CREATE_USED_PASSWORD; }
 	| COMMENT_SYM opt_equal TEXT_STRING_sys	{ Lex->create_info.comment=$3.str; Lex->create_info.used_fields|= HA_CREATE_USED_COMMENT; }
 	| AUTO_INC opt_equal ulonglong_num	{ Lex->create_info.auto_increment_value=$3; Lex->create_info.used_fields|= HA_CREATE_USED_AUTO;}
-	| PACK_KEYS_SYM opt_equal ulong_num	{ Lex->create_info.table_options|= $3 ? HA_OPTION_PACK_KEYS : HA_OPTION_NO_PACK_KEYS; Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;}
-	| PACK_KEYS_SYM opt_equal DEFAULT	{ Lex->create_info.table_options&= ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS); Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;}
+        | PACK_KEYS_SYM opt_equal ulong_num
+          {
+            switch($3) {
+            case 0:
+                Lex->create_info.table_options|= HA_OPTION_NO_PACK_KEYS;
+                break;
+            case 1:
+                Lex->create_info.table_options|= HA_OPTION_PACK_KEYS;
+                break;
+            default:
+                yyerror(ER(ER_SYNTAX_ERROR));
+                YYABORT;
+            }
+            Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;
+          }
+        | PACK_KEYS_SYM opt_equal DEFAULT
+          {
+            Lex->create_info.table_options&=
+              ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS);
+            Lex->create_info.used_fields|= HA_CREATE_USED_PACK_KEYS;
+          }
 	| CHECKSUM_SYM opt_equal ulong_num	{ Lex->create_info.table_options|= $3 ? HA_OPTION_CHECKSUM : HA_OPTION_NO_CHECKSUM; Lex->create_info.used_fields|= HA_CREATE_USED_CHECKSUM; }
 	| DELAY_KEY_WRITE_SYM opt_equal ulong_num { Lex->create_info.table_options|= $3 ? HA_OPTION_DELAY_KEY_WRITE : HA_OPTION_NO_DELAY_KEY_WRITE;  Lex->create_info.used_fields|= HA_CREATE_USED_DELAY_KEY_WRITE; }
 	| ROW_FORMAT_SYM opt_equal row_types	{ Lex->create_info.row_type= $3;  Lex->create_info.used_fields|= HA_CREATE_USED_ROW_FORMAT; }