Bug#22043 MySQL don't add "USE <DATABASE>" before "DROP PROCEDURE IF EXISTS"

- Refactoring of duplicate code
- Modified bad test cases
- Changed expected error when operating on information_schema.


mysql-test/r/information_schema.result:
  - updated result file with new error code.
mysql-test/r/rpl_sp.result:
  - Modified test case
mysql-test/t/information_schema.test:
  - Changed error code for operations on information_schema
mysql-test/t/rpl_sp.test:
  - Modified test case
sql/sql_parse.cc:
  - Cleaned up code:
    * replace tab with space
    * simplified if/switch statements
    * refactored duplicated code

mysql-test/r/information_schema.result

@@ -1027,7 +1027,7 @@ CREATE PROCEDURE p1 ()
 BEGIN
 SELECT 'foo' FROM DUAL;
 END |
-ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
+ERROR 42000: Unknown database 'information_schema'
 select  ROUTINE_NAME from routines;
 ROUTINE_NAME
 grant all on information_schema.* to 'user1'@'localhost';

mysql-test/r/rpl_sp.result

@@ -465,6 +465,7 @@ RETURN 0
 DROP PROCEDURE p1;
 DROP FUNCTION f1;
 drop table t1;
+reset master;
 drop database if exists mysqltest;
 drop database if exists mysqltest2;
 create database mysqltest;
@@ -473,19 +474,15 @@ use mysqltest2;
 create table t ( t integer );
 create procedure mysqltest.test() begin end;
 insert into t values ( 1 );
-show binlog events in 'master-bin.000001' from 8186;
+show binlog events in 'master-bin.000001' from 98;
 Log_name	Pos	Event_type	Server_id	End_log_pos	Info
-master-bin.000001	8186	Query	1	8317	use `test`; CREATE DEFINER=`root`@`localhost` FUNCTION f1() RETURNS INT RETURN 0
-master-bin.000001	8317	Query	1	8397	use `test`; DROP PROCEDURE p1
-master-bin.000001	8397	Query	1	8476	use `test`; DROP FUNCTION f1
-master-bin.000001	8476	Query	1	8552	use `test`; drop table t1
-master-bin.000001	8552	Query	1	8653	drop database if exists mysqltest
-master-bin.000001	8653	Query	1	8756	drop database if exists mysqltest2
-master-bin.000001	8756	Query	1	8849	create database mysqltest
-master-bin.000001	8849	Query	1	8944	create database mysqltest2
-master-bin.000001	8944	Query	1	9041	use `mysqltest2`; create table t ( t integer )
-master-bin.000001	9041	Query	1	9180	use `mysqltest2`; CREATE DEFINER=`root`@`localhost` procedure mysqltest.test() begin end
-master-bin.000001	9180	Query	1	9275	use `mysqltest2`; insert into t values ( 1 )
+master-bin.000001	98	Query	1	199	drop database if exists mysqltest
+master-bin.000001	199	Query	1	302	drop database if exists mysqltest2
+master-bin.000001	302	Query	1	395	create database mysqltest
+master-bin.000001	395	Query	1	490	create database mysqltest2
+master-bin.000001	490	Query	1	587	use `mysqltest2`; create table t ( t integer )
+master-bin.000001	587	Query	1	726	use `mysqltest2`; CREATE DEFINER=`root`@`localhost` procedure mysqltest.test() begin end
+master-bin.000001	726	Query	1	821	use `mysqltest2`; insert into t values ( 1 )
 create procedure `\\`.test() begin end;
 ERROR 42000: Incorrect database name '\\'
 drop database mysqltest;

mysql-test/t/information_schema.test

@@ -715,7 +715,7 @@ create temporary table schemata(f1 char(10));
 # Bug #10708 SP's can use INFORMATION_SCHEMA as ROUTINE_SCHEMA
 #
 delimiter |;
---error 1044
+--error ER_BAD_DB_ERROR
 CREATE PROCEDURE p1 ()
 BEGIN
   SELECT 'foo' FROM DUAL;

mysql-test/t/rpl_sp.test

@@ -524,6 +524,7 @@ sync_slave_with_master;
 # Bug22043: MySQL don't add "USE <DATABASE>" before "DROP PROCEDURE IF EXISTS"
 #
 connection master;
+reset master;
 --disable_warnings
 drop database if exists mysqltest;
 drop database if exists mysqltest2;
@@ -534,7 +535,7 @@ use mysqltest2;
 create table t ( t integer );
 create procedure mysqltest.test() begin end;
 insert into t values ( 1 );
-show binlog events in 'master-bin.000001' from 8186;
+show binlog events in 'master-bin.000001' from 98;
 --error ER_WRONG_DB_NAME
 create procedure `\\`.test() begin end;
 # Clean up

sql/sql_parse.cc

@@ -4221,11 +4221,10 @@ mysql_execute_command(THD *thd)
   {
     uint namelen;
     char *name;
-    int result;
+    int result= SP_INTERNAL_ERROR;
 
     DBUG_ASSERT(lex->sphead != 0);
     DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
-
     /*
       Verify that the database name is allowed, optionally
       lowercase it.
@@ -4233,37 +4232,26 @@ mysql_execute_command(THD *thd)
     if (check_db_name(lex->sphead->m_db.str))
     {
       my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
-      delete lex->sphead;
-      lex->sphead= 0;
-      goto error;
+      goto create_sp_error;
     }
 
     /*
-      Check that a database with this name
-      exists.
+      Check that a database directory with this name
+      exists. Design note: This won't work on virtual databases
+      like information_schema.
     */
     if (check_db_dir_existence(lex->sphead->m_db.str))
     {
       my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
-      delete lex->sphead;
-      lex->sphead= 0;
-      goto error;
+      goto create_sp_error;
     }
 
     if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                      is_schema_db(lex->sphead->m_db.str)))
-    {
-      delete lex->sphead;
-      lex->sphead= 0;
-      goto error;
-    }
+      goto create_sp_error;
 
-    if (end_active_trans(thd)) 
-    {
-      delete lex->sphead;
-      lex->sphead= 0;
-      goto error;
-    }
+    if (end_active_trans(thd))
+      goto create_sp_error;
 
     name= lex->sphead->name(&namelen);
 #ifdef HAVE_DLOPEN
@@ -4273,10 +4261,8 @@ mysql_execute_command(THD *thd)
 
       if (udf)
       {
-	my_error(ER_UDF_EXISTS, MYF(0), name);
-	delete lex->sphead;
-	lex->sphead= 0;
-	goto error;
+        my_error(ER_UDF_EXISTS, MYF(0), name);
+        goto create_sp_error;
       }
     }
 #endif
@@ -4284,7 +4270,7 @@ mysql_execute_command(THD *thd)
     /*
       If the definer is not specified, this means that CREATE-statement missed
       DEFINER-clause. DEFINER-clause can be missed in two cases:
-      
+
         - The user submitted a statement w/o the clause. This is a normal
           case, we should assign CURRENT_USER as definer.
 
@@ -4293,7 +4279,7 @@ mysql_execute_command(THD *thd)
           CURRENT_USER as definer here, but also we should mark this routine
           as NON-SUID. This is essential for the sake of backward
           compatibility.
-          
+
           The problem is the slave thread is running under "special" user (@),
           that actually does not exist. In the older versions we do not fail
           execution of a stored routine if its definer does not exist and
@@ -4318,13 +4304,9 @@ mysql_execute_command(THD *thd)
       if (ps_arena)
         thd->restore_active_arena(ps_arena, &original_arena);
 
+      /* Error has been already reported. */
       if (res)
-      {
-        /* Error has been already reported. */
-        delete lex->sphead;
-        lex->sphead= 0;
-        goto error;
-      }
+        goto create_sp_error;
 
       if (thd->slave_thread)
         lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
@@ -4335,7 +4317,7 @@ mysql_execute_command(THD *thd)
       that the current user has SUPER privilege (in order to create a stored
       routine under another user one must have SUPER privilege).
     */
-    
+
     else if (strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
         my_strcasecmp(system_charset_info,
                       lex->definer->host.str,
@@ -4344,9 +4326,7 @@ mysql_execute_command(THD *thd)
       if (check_global_access(thd, SUPER_ACL))
       {
         my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
-        delete lex->sphead;
-        lex->sphead= 0;
-        goto error;
+        goto create_sp_error;
       }
     }
 
@@ -4366,54 +4346,51 @@ mysql_execute_command(THD *thd)
 #endif /* NO_EMBEDDED_ACCESS_CHECKS */
 
     res= (result= lex->sphead->create(thd));
-    if (result == SP_OK)
-    {
+    switch (result) {
+    case SP_OK:
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
       /* only add privileges if really neccessary */
       if (sp_automatic_privileges && !opt_noacl &&
           check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
-      			       lex->sphead->m_db.str, name,
+                               lex->sphead->m_db.str, name,
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
       {
-        close_thread_tables(thd);
         if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
                                 lex->sql_command == SQLCOM_CREATE_PROCEDURE))
-          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
-	  	       ER_PROC_AUTO_GRANT_FAIL,
-		       ER(ER_PROC_AUTO_GRANT_FAIL));
+          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                       ER_PROC_AUTO_GRANT_FAIL,
+                       ER(ER_PROC_AUTO_GRANT_FAIL));
+        close_thread_tables(thd);
       }
 #endif
-      lex->unit.cleanup();
-      delete lex->sphead;
-      lex->sphead= 0;
-      send_ok(thd);
-    }
-    else
-    {
-      switch (result) {
-      case SP_WRITE_ROW_FAILED:
-	my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
-	break;
-      case SP_NO_DB_ERROR:
-	my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
-	break;
-      case SP_BAD_IDENTIFIER:
-	my_error(ER_TOO_LONG_IDENT, MYF(0), name);
-	break;
-      case SP_BODY_TOO_LONG:
-	my_error(ER_TOO_LONG_BODY, MYF(0), name);
-	break;
-      default:
-	my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
-	break;
-      }
-      lex->unit.cleanup();
-      delete lex->sphead;
-      lex->sphead= 0;
-      goto error;
-    }
     break;
-  }
+    case SP_WRITE_ROW_FAILED:
+      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
+    break;
+    case SP_BAD_IDENTIFIER:
+      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
+    break;
+    case SP_BODY_TOO_LONG:
+      my_error(ER_TOO_LONG_BODY, MYF(0), name);
+    break;
+    default:
+      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
+    break;
+    } /* end switch */
+
+    /*
+      Capture all errors within this CASE and
+      clean up the environment.
+    */
+create_sp_error:
+    lex->unit.cleanup();
+    delete lex->sphead;
+    lex->sphead= 0;
+    if (result != SP_OK )
+      goto error;
+    send_ok(thd);
+    break; /* break super switch */
+  } /* end case group bracket */
   case SQLCOM_CALL:
     {
       sp_head *sp;