This cset fixes BUG# 12838, 14061, 12129

mysqldump.result:
  BUG# 12838
      New test results for mysqldump -x on a DB with views
mysqldump.test:
  sqldump.test:
      BUG# 12838
      New test to run mysqldump -x on a DB with views
mysqldump.c:
  BUG# 12838
      Removed/Changed code which created tables to be put into the dump
      (For loading views of views) by creating temp tables and then using
      the CREATE TABLE information in those temp tables. The problem with this
      is that when mysqldump -x is called, it locks all tables, so the
      temp tables could not be created, causing the mysqldump to exit with
      failure. The code was changed to use SHOW FIELDS to get the column
      names and type to build CREATE TABLE text used to create these tables
      that views need in the dump.


client/mysqldump.c:
  BUG# 12838
      Removed/Changed code which created tables to be put into the dump
      (For loading views of views) by creating temp tables and then using
      the CREATE TABLE information in those temp tables. The problem with this
      is that when mysqldump -x is called, it locks all tables, so the
      temp tables could not be created, causing the mysqldump to exit with
      failure. The code was changed to use SHOW FIELDS to get the column
      names and type to build CREATE TABLE text used to create these tables
      that views need in the dump.
mysql-test/t/mysqldump.test:
  sqldump.test:
      BUG# 12838
      New test to run mysqldump -x on a DB with views
mysql-test/r/mysqldump.result:
  BUG# 12838
      New test results for mysqldump -x on a DB with views

client/mysqldump.c

@@ -386,7 +386,7 @@ static struct my_option my_long_options[] =
      (gptr*) &opt_dump_triggers, (gptr*) &opt_dump_triggers, 0, GET_BOOL,
      NO_ARG, 1, 0, 0, 0, 0, 0},
   {"tz-utc", OPT_TZ_UTC,
-    "SET TIME_ZONE='+00:00' at top of dump to allow dumping of TIMESTAMP data between servers with different time zones.",
+    "SET TIME_ZONE='+00:00' at top of dump to allow dumping of TIMESTAMP data when a server has data in different time zones or data is being moved between servers with different time zones.",
     (gptr*) &opt_tz_utc, (gptr*) &opt_tz_utc, 0, GET_BOOL, NO_ARG, 1, 0, 0, 0, 0, 0},
 #ifndef DONT_ALLOW_USER_CHANGE
   {"user", 'u', "User for login if not current user.",
@@ -1328,17 +1328,17 @@ static uint dump_routines_for_db(char *db)
 static uint get_table_structure(char *table, char *db, char *table_type,
                                 char *ignore_flag)
 {
-  MYSQL_RES  *tableRes;
-  MYSQL_ROW  row;
   my_bool    init=0, delayed, write_data, complete_insert;
-  uint       num_fields;
+  my_ulonglong num_fields;
   char	     *result_table, *opt_quoted_table;
   const char *insert_option;
   char	     name_buff[NAME_LEN+3],table_buff[NAME_LEN*2+3];
-  char	     table_buff2[NAME_LEN*2+3];
-  char       query_buff[512];
+  char	     table_buff2[NAME_LEN*2+3], query_buff[512];
   FILE       *sql_file = md_result_file;
   int        len;
+  MYSQL_RES  *result;
+  MYSQL_ROW  row;
+
   DBUG_ENTER("get_table_structure");
   DBUG_PRINT("enter", ("db: %s  table: %s", db, table));
 
@@ -1424,71 +1424,79 @@ static uint get_table_structure(char *table, char *db, char *table_type,
 	check_io(sql_file);
       }
 
-      tableRes= mysql_store_result(sock);
-      field= mysql_fetch_field_direct(tableRes, 0);
+      result= mysql_store_result(sock);
+      field= mysql_fetch_field_direct(result, 0);
       if (strcmp(field->name, "View") == 0)
       {
         if (verbose)
           fprintf(stderr, "-- It's a view, create dummy table for view\n");
 
-        mysql_free_result(tableRes);
+        mysql_free_result(result);
+
+        /*
+          Create a table with the same name as the view and with columns of 
+          the same name in order to satisfy views that depend on this view.
+          The table will be removed when the actual view is created.
 
-        /* Create a dummy table for the view. ie. a table  which has the
-           same columns as the view should have. This table is dropped
-           just before the view is created. The table is used to handle the
-           case where a view references another view, which hasn't yet been
-           created(during the load of the dump). BUG#10927 */
+          The properties of each column, aside from the data type, are not
+          preserved in this temporary table, because they are not necessary.
 
-        /* Create temp table by selecting from the view */
+          This will not be necessary once we can determine dependencies
+          between views and can simply dump them in the appropriate order.
+        */
         my_snprintf(query_buff, sizeof(query_buff),
-                    "CREATE TEMPORARY TABLE %s SELECT * FROM %s WHERE 0",
-                    result_table, result_table);
+                    "SHOW FIELDS FROM %s", result_table);
         if (mysql_query_with_error_report(sock, 0, query_buff))
         {
           safe_exit(EX_MYSQLERR);
           DBUG_RETURN(0);
         }
 
-        /* Get CREATE statement for the temp table */
-        my_snprintf(query_buff, sizeof(query_buff), "SHOW CREATE TABLE %s",
-                    result_table);
-        if (mysql_query_with_error_report(sock, 0, query_buff))
+        if ((result= mysql_store_result(sock)))
+        {
+          if (mysql_num_rows(result))
           {
-          safe_exit(EX_MYSQLERR);
-          DBUG_RETURN(0);
-        }
-        tableRes= mysql_store_result(sock);
-        row= mysql_fetch_row(tableRes);
-
             if (opt_drop)
+            {
               fprintf(sql_file, "/*!50001 DROP VIEW IF EXISTS %s*/;\n",
                       opt_quoted_table);
-
-        /* Print CREATE statement but remove TEMPORARY */
-        fprintf(sql_file, "/*!50001 CREATE %s*/;\n", row[1]+17);
               check_io(sql_file);
+            }
 
-        mysql_free_result(tableRes);
+            fprintf(sql_file, "/*!50001 CREATE TABLE %s (\n", result_table);
+            /*
+               Get first row, following loop will prepend comma - keeps
+               from having to know if the row being printed is last to
+               determine if there should be a _trailing_ comma.
+            */
+            row= mysql_fetch_row(result);
 
-        /* Drop the temp table */
-        my_snprintf(buff, sizeof(buff),
-                    "DROP TEMPORARY TABLE %s", result_table);
-        if (mysql_query_with_error_report(sock, 0, buff))
+            fprintf(sql_file, "  %s %s", quote_name(row[0], name_buff, 0), row[1]);
+
+            while((row= mysql_fetch_row(result)))
             {
-          safe_exit(EX_MYSQLERR);
-          DBUG_RETURN(0);
+              /* col name, col type */
+              fprintf(sql_file, ",\n  %s %s",
+                      quote_name(row[0], name_buff, 0), row[1]);
+            }
+            fprintf(sql_file, "\n) */;\n");
+            check_io(sql_file);
           }
+        }
+        mysql_free_result(result);
+
         was_views= 1;
         DBUG_RETURN(0);
       }
-      row= mysql_fetch_row(tableRes);
+
+      row= mysql_fetch_row(result);
       fprintf(sql_file, "%s;\n", row[1]);
       check_io(sql_file);
-      mysql_free_result(tableRes);
+      mysql_free_result(result);
     }
     my_snprintf(query_buff, sizeof(query_buff), "show fields from %s",
 		result_table);
-    if (mysql_query_with_error_report(sock, &tableRes, query_buff))
+    if (mysql_query_with_error_report(sock, &result, query_buff))
     {
       if (path)
 	my_fclose(sql_file, MYF(MY_WME));
@@ -1520,7 +1528,7 @@ static uint get_table_structure(char *table, char *db, char *table_type,
       }
     }
 
-    while ((row=mysql_fetch_row(tableRes)))
+    while ((row= mysql_fetch_row(result)))
     {
       if (complete_insert)
       {
@@ -1533,8 +1541,8 @@ static uint get_table_structure(char *table, char *db, char *table_type,
                       quote_name(row[SHOW_FIELDNAME], name_buff, 0));
       }
     }
-    num_fields= (uint) mysql_num_rows(tableRes);
-    mysql_free_result(tableRes);
+    num_fields= mysql_num_rows(result);
+    mysql_free_result(result);
   }
   else
   {
@@ -1545,7 +1553,7 @@ static uint get_table_structure(char *table, char *db, char *table_type,
 
     my_snprintf(query_buff, sizeof(query_buff), "show fields from %s",
 		result_table);
-    if (mysql_query_with_error_report(sock, &tableRes, query_buff))
+    if (mysql_query_with_error_report(sock, &result, query_buff))
     {
       safe_exit(EX_MYSQLERR);
       DBUG_RETURN(0);
@@ -1595,9 +1603,9 @@ static uint get_table_structure(char *table, char *db, char *table_type,
       }
     }
 
-    while ((row=mysql_fetch_row(tableRes)))
+    while ((row= mysql_fetch_row(result)))
     {
-      ulong *lengths=mysql_fetch_lengths(tableRes);
+      ulong *lengths= mysql_fetch_lengths(result);
       if (init)
       {
         if (!opt_xml && !tFlag)
@@ -1616,7 +1624,7 @@ static uint get_table_structure(char *table, char *db, char *table_type,
       {
 	if (opt_xml)
 	{
-	  print_xml_row(sql_file, "field", tableRes, &row);
+	  print_xml_row(sql_file, "field", result, &row);
 	  continue;
 	}
 
@@ -1640,15 +1648,15 @@ static uint get_table_structure(char *table, char *db, char *table_type,
 	check_io(sql_file);
       }
     }
-    num_fields = (uint) mysql_num_rows(tableRes);
-    mysql_free_result(tableRes);
+    num_fields= mysql_num_rows(result);
+    mysql_free_result(result);
     if (!tFlag)
     {
       /* Make an sql-file, if path was given iow. option -T was given */
       char buff[20+FN_REFLEN];
       uint keynr,primary_key;
       my_snprintf(buff, sizeof(buff), "show keys from %s", result_table);
-      if (mysql_query_with_error_report(sock, &tableRes, buff))
+      if (mysql_query_with_error_report(sock, &result, buff))
       {
         if (mysql_errno(sock) == ER_WRONG_OBJECT)
         {
@@ -1667,7 +1675,7 @@ static uint get_table_structure(char *table, char *db, char *table_type,
       /* Find first which key is primary key */
       keynr=0;
       primary_key=INT_MAX;
-      while ((row=mysql_fetch_row(tableRes)))
+      while ((row= mysql_fetch_row(result)))
       {
         if (atoi(row[3]) == 1)
         {
@@ -1683,13 +1691,13 @@ static uint get_table_structure(char *table, char *db, char *table_type,
 	  }
         }
       }
-      mysql_data_seek(tableRes,0);
+      mysql_data_seek(result,0);
       keynr=0;
-      while ((row=mysql_fetch_row(tableRes)))
+      while ((row= mysql_fetch_row(result)))
       {
 	if (opt_xml)
 	{
-	  print_xml_row(sql_file, "key", tableRes, &row);
+	  print_xml_row(sql_file, "key", result, &row);
 	  continue;
 	}
 
@@ -1730,7 +1738,7 @@ static uint get_table_structure(char *table, char *db, char *table_type,
         my_snprintf(buff, sizeof(buff), "show table status like %s",
 		    quote_for_like(table, show_name_buff));
 
-        if (mysql_query_with_error_report(sock, &tableRes, buff))
+        if (mysql_query_with_error_report(sock, &result, buff))
         {
 	  if (mysql_errno(sock) != ER_PARSE_ERROR)
 	  {					/* If old MySQL version */
@@ -1740,7 +1748,7 @@ static uint get_table_structure(char *table, char *db, char *table_type,
 		      result_table,mysql_error(sock));
 	  }
         }
-        else if (!(row=mysql_fetch_row(tableRes)))
+        else if (!(row= mysql_fetch_row(result)))
         {
 	  fprintf(stderr,
 		  "Error: Couldn't read status information for table %s (%s)\n",
@@ -1749,18 +1757,18 @@ static uint get_table_structure(char *table, char *db, char *table_type,
         else
         {
 	  if (opt_xml)
-	    print_xml_row(sql_file, "options", tableRes, &row);
+	    print_xml_row(sql_file, "options", result, &row);
 	  else
 	  {
 	    fputs("/*!",sql_file);
-	    print_value(sql_file,tableRes,row,"engine=","Engine",0);
-	    print_value(sql_file,tableRes,row,"","Create_options",0);
-	    print_value(sql_file,tableRes,row,"comment=","Comment",1);
+	    print_value(sql_file,result,row,"engine=","Engine",0);
+	    print_value(sql_file,result,row,"","Create_options",0);
+	    print_value(sql_file,result,row,"comment=","Comment",1);
 	    fputs(" */",sql_file);
 	    check_io(sql_file);
 	  }
         }
-        mysql_free_result(tableRes);		/* Is always safe to free */
+        mysql_free_result(result);		/* Is always safe to free */
       }
 continue_xml:
       if (!opt_xml)
@@ -1827,7 +1835,7 @@ static void dump_triggers_for_table (char *table, char *db)
   if (mysql_num_rows(result))
     fprintf(sql_file, "\n/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;\n\
 DELIMITER ;;\n");
-  while ((row=mysql_fetch_row(result)))
+  while ((row= mysql_fetch_row(result)))
   {
     fprintf(sql_file, "/*!50003 SET SESSION SQL_MODE=\"%s\" */;;\n\
 /*!50003 CREATE TRIGGER %s %s %s ON %s FOR EACH ROW%s */;;\n\n",
@@ -2119,10 +2127,10 @@ static void dump_table(char *table, char *db)
       check_io(md_result_file);
     }
 
-    while ((row=mysql_fetch_row(res)))
+    while ((row= mysql_fetch_row(res)))
     {
       uint i;
-      ulong *lengths=mysql_fetch_lengths(res);
+      ulong *lengths= mysql_fetch_lengths(res);
       rownr++;
       if (!extended_insert && !opt_xml)
       {

mysql-test/r/mysqldump.result

@@ -1459,8 +1459,8 @@ UNLOCK TABLES;
 DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
-  `a` varchar(30) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1*/;
+  `a` varchar(30)
+) */;
 /*!50001 DROP TABLE IF EXISTS `v2`*/;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select `t2`.`a` AS `a` from `t2` where (`t2`.`a` like _latin1'a%') WITH CASCADED CHECK OPTION*/;
@@ -1702,8 +1702,8 @@ UNLOCK TABLES;
 DROP TABLE IF EXISTS `v1`;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE TABLE `v1` (
-  `a` int(11) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1*/;
+  `a` int(11)
+) */;
 /*!50001 DROP TABLE IF EXISTS `v1`*/;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `a` from `t1`*/;
@@ -1757,8 +1757,8 @@ UNLOCK TABLES;
 DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
-  `a` varchar(30) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1*/;
+  `a` varchar(30)
+) */;
 /*!50001 DROP TABLE IF EXISTS `v2`*/;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select `t2`.`a` AS `a` from `t2` where (`t2`.`a` like _latin1'a%') WITH CASCADED CHECK OPTION*/;
@@ -1846,22 +1846,22 @@ UNLOCK TABLES;
 DROP TABLE IF EXISTS `v1`;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE TABLE `v1` (
-  `a` int(11) default NULL,
-  `b` int(11) default NULL,
-  `c` varchar(30) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1*/;
+  `a` int(11),
+  `b` int(11),
+  `c` varchar(30)
+) */;
 DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
-  `a` int(11) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1*/;
+  `a` int(11)
+) */;
 DROP TABLE IF EXISTS `v3`;
 /*!50001 DROP VIEW IF EXISTS `v3`*/;
 /*!50001 CREATE TABLE `v3` (
-  `a` int(11) default NULL,
-  `b` int(11) default NULL,
-  `c` varchar(30) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1*/;
+  `a` int(11),
+  `b` int(11),
+  `c` varchar(30)
+) */;
 /*!50001 DROP TABLE IF EXISTS `v1`*/;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `v3`.`a` AS `a`,`v3`.`b` AS `b`,`v3`.`c` AS `c` from `v3` where (`v3`.`b` in (1,2,3,4,5,6,7))*/;
@@ -2374,3 +2374,92 @@ UNLOCK TABLES;
 DROP TRIGGER `test trig`;
 DROP TABLE `t1 test`;
 DROP TABLE `t2 test`;
+drop table if exists t1;
+create table t1 (a int, b varchar(32), c varchar(32));
+insert into t1 values (1, 'first value', 'xxxx');
+insert into t1 values (2, 'second value', 'tttt');
+insert into t1 values (3, 'third value', 'vvv vvv');
+create view v1 as select * from t1;
+create view v0 as select * from v1;
+create view v2 as select * from v0;
+select * from v2;
+a	b	c
+1	first value	xxxx
+2	second value	tttt
+3	third value	vvv vvv
+
+/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
+/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
+/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
+/*!40101 SET NAMES utf8 */;
+/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
+/*!40103 SET TIME_ZONE='+00:00' */;
+/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
+/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
+/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
+/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
+
+CREATE DATABASE /*!32312 IF NOT EXISTS*/ `test` /*!40100 DEFAULT CHARACTER SET latin1 */;
+
+USE `test`;
+DROP TABLE IF EXISTS `t1`;
+CREATE TABLE `t1` (
+  `a` int(11) default NULL,
+  `b` varchar(32) default NULL,
+  `c` varchar(32) default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1;
+
+
+/*!40000 ALTER TABLE `t1` DISABLE KEYS */;
+LOCK TABLES `t1` WRITE;
+INSERT INTO `t1` VALUES (1,'first value','xxxx'),(2,'second value','tttt'),(3,'third value','vvv vvv');
+UNLOCK TABLES;
+/*!40000 ALTER TABLE `t1` ENABLE KEYS */;
+DROP TABLE IF EXISTS `v0`;
+/*!50001 DROP VIEW IF EXISTS `v0`*/;
+/*!50001 CREATE TABLE `v0` (
+  `a` int(11),
+  `b` varchar(32),
+  `c` varchar(32)
+) */;
+DROP TABLE IF EXISTS `v1`;
+/*!50001 DROP VIEW IF EXISTS `v1`*/;
+/*!50001 CREATE TABLE `v1` (
+  `a` int(11),
+  `b` varchar(32),
+  `c` varchar(32)
+) */;
+DROP TABLE IF EXISTS `v2`;
+/*!50001 DROP VIEW IF EXISTS `v2`*/;
+/*!50001 CREATE TABLE `v2` (
+  `a` int(11),
+  `b` varchar(32),
+  `c` varchar(32)
+) */;
+
+CREATE DATABASE /*!32312 IF NOT EXISTS*/ `test` /*!40100 DEFAULT CHARACTER SET latin1 */;
+
+USE `test`;
+/*!50001 DROP TABLE IF EXISTS `v0`*/;
+/*!50001 DROP VIEW IF EXISTS `v0`*/;
+/*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v0` AS select `v1`.`a` AS `a`,`v1`.`b` AS `b`,`v1`.`c` AS `c` from `v1`*/;
+/*!50001 DROP TABLE IF EXISTS `v1`*/;
+/*!50001 DROP VIEW IF EXISTS `v1`*/;
+/*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`a` AS `a`,`t1`.`b` AS `b`,`t1`.`c` AS `c` from `t1`*/;
+/*!50001 DROP TABLE IF EXISTS `v2`*/;
+/*!50001 DROP VIEW IF EXISTS `v2`*/;
+/*!50001 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select `v0`.`a` AS `a`,`v0`.`b` AS `b`,`v0`.`c` AS `c` from `v0`*/;
+/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
+
+/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
+/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
+/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
+/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
+/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
+
+drop view v2;
+drop view v0;
+drop view v1;
+drop table t1;

mysql-test/t/mysqldump.test

@@ -962,3 +962,26 @@ DROP TRIGGER `test trig`;
 DROP TABLE `t1 test`;
 DROP TABLE `t2 test`;
 --enable_warnings
+#
+# BUG# 12838 mysqldump -x with views exits with error 
+#
+
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+create table t1 (a int, b varchar(32), c varchar(32));
+insert into t1 values (1, 'first value', 'xxxx');
+insert into t1 values (2, 'second value', 'tttt');
+insert into t1 values (3, 'third value', 'vvv vvv');
+
+create view v1 as select * from t1;
+create view v0 as select * from v1;
+create view v2 as select * from v0;
+
+select * from v2;
+--exec $MYSQL_DUMP -x --skip-comments --databases test
+
+drop view v2;
+drop view v0;
+drop view v1;
+drop table t1;