branches/zip: Disallow duplicate index name when creating an index.

This should fix Mantis Issue #461.

innodb.test, innodb.result, innodb-index.test, innodb-index.result:
Adjust the test result and mention that the introduced restriction
has been reported as MySQL Bug #51451.

innobase_check_index_keys(): Add a parameter for the InnoDB table and
check that no duplicate index name is added.  Report errors by
my_error() instead of sql_print_error().

rb://260 approved by Sunny Bains

handler/handler0alter.cc

@@ -229,9 +229,11 @@ static
 int
 innobase_check_index_keys(
 /*======================*/
-	const KEY*	key_info,	/*!< in: Indexes to be created */
-	ulint		num_of_keys)	/*!< in: Number of indexes to
-					be created */
+	const KEY*		key_info,	/*!< in: Indexes to be
+						created */
+	ulint			num_of_keys,	/*!< in: Number of
+						indexes to be created */
+	const dict_table_t*	table)		/*!< in: Existing indexes */
 {
 	ulint		key_num;
 
@@ -248,8 +250,21 @@ innobase_check_index_keys(
 			const KEY&	key2 = key_info[i];
 
 			if (0 == strcmp(key.name, key2.name)) {
-				sql_print_error("InnoDB: key name `%s` appears"
-						" twice in CREATE INDEX\n",
+				my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0),
+					 key.name);
+
+				return(ER_WRONG_NAME_FOR_INDEX);
+			}
+		}
+
+		/* Check that the same index name does not already exist. */
+
+		for (const dict_index_t* index
+			     = dict_table_get_first_index(table);
+		     index; index = dict_table_get_next_index(index)) {
+
+			if (0 == strcmp(key.name, index->name)) {
+				my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0),
 					 key.name);
 
 				return(ER_WRONG_NAME_FOR_INDEX);
@@ -258,7 +273,7 @@ innobase_check_index_keys(
 
 		/* Check that MySQL does not try to create a column
 		prefix index field on an inappropriate data type and
-		that the same colum does not appear twice in the index. */
+		that the same column does not appear twice in the index. */
 
 		for (ulint i = 0; i < key.key_parts; i++) {
 			const KEY_PART_INFO&	key_part1
@@ -289,14 +304,8 @@ innobase_check_index_keys(
 					}
 				}
 
-				sql_print_error("InnoDB: MySQL is trying to"
-						" create a column prefix"
-						" index field on an"
-						" inappropriate data type."
-						" column `%s`,"
-						" index `%s`.\n",
-						field->field_name,
-						key.name);
+				my_error(ER_WRONG_KEY_COLUMN, MYF(0),
+					 field->field_name);
 				return(ER_WRONG_KEY_COLUMN);
 			}
 
@@ -309,11 +318,8 @@ innobase_check_index_keys(
 					continue;
 				}
 
-				sql_print_error("InnoDB: column `%s`"
-						" is not allowed to occur"
-						" twice in index `%s`.\n",
-						key_part1.field->field_name,
-						key.name);
+				my_error(ER_WRONG_KEY_COLUMN, MYF(0),
+					 key_part1.field->field_name);
 				return(ER_WRONG_KEY_COLUMN);
 			}
 		}
@@ -666,7 +672,8 @@ ha_innobase::add_index(
 		error = -1;
 	} else {
 		/* Check that index keys are sensible */
-		error = innobase_check_index_keys(key_info, num_of_keys);
+		error = innobase_check_index_keys(key_info, num_of_keys,
+						  innodb_table);
 	}
 
 	if (UNIV_UNLIKELY(error)) {
@@ -808,18 +815,6 @@ err_exit:
 					index, num_of_idx, table);
 
 error_handling:
-#ifdef UNIV_DEBUG
-	/* TODO: At the moment we can't handle the following statement
-	in our debugging code below:
-
-	alter table t drop index b, add index (b);
-
-	The fix will have to parse the SQL and note that the index
-	being added has the same name as the one being dropped and
-	ignore that in the dup index check.*/
-	//dict_table_check_for_dup_indexes(prebuilt->table);
-#endif
-
 	/* After an error, remove all those index definitions from the
 	dictionary which were defined. */
 
@@ -831,6 +826,8 @@ error_handling:
 		row_mysql_lock_data_dictionary(trx);
 		dict_locked = TRUE;
 
+		ut_d(dict_table_check_for_dup_indexes(prebuilt->table));
+
 		if (!new_primary) {
 			error = row_merge_rename_indexes(trx, indexed_table);
 
@@ -1211,9 +1208,7 @@ ha_innobase::final_drop_index(
 	valid index entry count in the translation table to zero */
 	share->idx_trans_tbl.index_count = 0;
 
-#ifdef UNIV_DEBUG
-	dict_table_check_for_dup_indexes(prebuilt->table);
-#endif
+	ut_d(dict_table_check_for_dup_indexes(prebuilt->table));
 
 func_exit:
 	trx_commit_for_mysql(trx);

mysql-test/innodb-index.result

@@ -441,6 +441,7 @@ t3	CREATE TABLE `t3` (
   KEY `c` (`c`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
 alter table t2 drop index b, add index (b);
+ERROR 42000: Incorrect index name 'b'
 show create table t2;
 Table	Create Table
 t2	CREATE TABLE `t2` (
@@ -451,8 +452,8 @@ t2	CREATE TABLE `t2` (
   `e` int(11) DEFAULT NULL,
   PRIMARY KEY (`a`),
   UNIQUE KEY `dc` (`d`,`c`),
-  KEY `c` (`c`),
   KEY `b` (`b`),
+  KEY `c` (`c`),
   CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`b`) ON DELETE CASCADE,
   CONSTRAINT `t2_ibfk_2` FOREIGN KEY (`c`) REFERENCES `t3` (`c`),
   CONSTRAINT `t2_ibfk_3` FOREIGN KEY (`d`) REFERENCES `t4` (`d`)

mysql-test/innodb-index.test

@@ -141,6 +141,8 @@ show create table t4;
 --error ER_CANT_CREATE_TABLE
 alter table t3 add constraint dc foreign key (a) references t1(a);
 show create table t3;
+# this should be fixed by MySQL (see Bug #51451)
+--error ER_WRONG_NAME_FOR_INDEX
 alter table t2 drop index b, add index (b);
 show create table t2;
 --error ER_ROW_IS_REFERENCED_2

mysql-test/innodb.result

@@ -692,6 +692,9 @@ select count(*) from t1 where sca_pic is null;
 count(*)
 2
 alter table t1 drop index sca_pic, add index sca_pic (cat_code, sca_pic);
+ERROR 42000: Incorrect index name 'sca_pic'
+alter table t1 drop index sca_pic;
+alter table t1 add index sca_pic (cat_code, sca_pic);
 select count(*) from t1 where sca_code='PD' and sca_pic is null;
 count(*)
 1
@@ -699,6 +702,9 @@ select count(*) from t1 where cat_code='E';
 count(*)
 0
 alter table t1 drop index sca_pic, add index (sca_pic, cat_code);
+ERROR 42000: Incorrect index name 'sca_pic'
+alter table t1 drop index sca_pic;
+alter table t1 add index (sca_pic, cat_code);
 select count(*) from t1 where sca_code='PD' and sca_pic is null;
 count(*)
 1
@@ -1833,6 +1839,7 @@ show variables like "innodb_thread_sleep_delay";
 Variable_name	Value
 innodb_thread_sleep_delay	10000
 set storage_engine=INNODB;
+set session old_alter_table=1;
 drop table if exists t1,t2,t3;
 --- Testing varchar ---
 --- Testing varchar ---
@@ -1970,7 +1977,7 @@ explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  '
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
-ERROR 23000: Duplicate entry 'v' for key 'v_2'
+ERROR 23000: Duplicate entry '{ ' for key 'v_2'
 alter table t1 add key(v);
 select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a';
 qq
@@ -2406,6 +2413,7 @@ select * from t1 where a=20 and b is null;
 a	b
 20	NULL
 drop table t1;
+set session old_alter_table=0;
 create table t1 (v varchar(65530), key(v));
 Warnings:
 Warning	1071	Specified key was too long; max key length is 767 bytes

mysql-test/innodb.test

@@ -427,11 +427,19 @@ INSERT INTO t1 ( sca_code, cat_code, sca_desc, lan_code, sca_pic, sca_sdesc, sca
 select count(*) from t1 where sca_code = 'PD';
 select count(*) from t1 where sca_code <= 'PD';
 select count(*) from t1 where sca_pic is null;
+# this should be fixed by MySQL (see Bug #51451)
+--error ER_WRONG_NAME_FOR_INDEX
 alter table t1 drop index sca_pic, add index sca_pic (cat_code, sca_pic);
+alter table t1 drop index sca_pic;
+alter table t1 add index sca_pic (cat_code, sca_pic);
 select count(*) from t1 where sca_code='PD' and sca_pic is null;
 select count(*) from t1 where cat_code='E';
 
+# this should be fixed by MySQL (see Bug #51451)
+--error ER_WRONG_NAME_FOR_INDEX
 alter table t1 drop index sca_pic, add index (sca_pic, cat_code);
+alter table t1 drop index sca_pic;
+alter table t1 add index (sca_pic, cat_code);
 select count(*) from t1 where sca_code='PD' and sca_pic is null;
 select count(*) from t1 where sca_pic >= 'n';
 select sca_pic from t1 where sca_pic is null;
@@ -1377,7 +1385,10 @@ show variables like "innodb_thread_sleep_delay";
 
 let $default=`select @@storage_engine`;
 set storage_engine=INNODB;
+# this should be fixed by MySQL (see Bug #51451)
+set session old_alter_table=1;
 source include/varchar.inc;
+set session old_alter_table=0;
 
 #
 # Some errors/warnings on create