Bug#31434 mysqldump dumps view as table

mysqldump creates stand-in tables before dumping the actual view.
Those tables were of the default type; if the view had more columns
than that (a pathological case, arguably), loading the dump would
fail. We now make the temporary stand-ins MyISAM tables to prevent
this.

client/mysqldump.c

@@ -1836,7 +1836,13 @@ static uint get_table_structure(char *table, char *db, char *table_type,
               fprintf(sql_file, ",\n  %s %s",
                       quote_name(row[0], name_buff, 0), row[1]);
             }
-            fprintf(sql_file, "\n) */;\n");
+            /*
+              Stand-in tables are always MyISAM tables as the default
+              engine might have a column-limit that's lower than the
+              number of columns in the view, and MyISAM support is
+              guaranteed to be in the server anyway.
+            */
+            fprintf(sql_file, "\n) ENGINE=MyISAM */;\n");
             check_io(sql_file);
           }
         }

mysql-test/r/mysqldump.result

@@ -1996,7 +1996,7 @@ DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
   `a` varchar(30)
-) */;
+) ENGINE=MyISAM */;
 /*!50001 DROP TABLE `v2`*/;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED */
@@ -2078,7 +2078,7 @@ DROP TABLE IF EXISTS `v1`;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE TABLE `v1` (
   `a` int(11)
-) */;
+) ENGINE=MyISAM */;
 /*!50001 DROP TABLE `v1`*/;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED */
@@ -2140,7 +2140,7 @@ DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
   `a` varchar(30)
-) */;
+) ENGINE=MyISAM */;
 /*!50001 DROP TABLE `v2`*/;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED */
@@ -2244,19 +2244,19 @@ DROP TABLE IF EXISTS `v1`;
   `a` int(11),
   `b` int(11),
   `c` varchar(30)
-) */;
+) ENGINE=MyISAM */;
 DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
   `a` int(11)
-) */;
+) ENGINE=MyISAM */;
 DROP TABLE IF EXISTS `v3`;
 /*!50001 DROP VIEW IF EXISTS `v3`*/;
 /*!50001 CREATE TABLE `v3` (
   `a` int(11),
   `b` int(11),
   `c` varchar(30)
-) */;
+) ENGINE=MyISAM */;
 /*!50001 DROP TABLE `v1`*/;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE ALGORITHM=UNDEFINED */
@@ -2860,21 +2860,21 @@ DROP TABLE IF EXISTS `v0`;
   `a` int(11),
   `b` varchar(32),
   `c` varchar(32)
-) */;
+) ENGINE=MyISAM */;
 DROP TABLE IF EXISTS `v1`;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE TABLE `v1` (
   `a` int(11),
   `b` varchar(32),
   `c` varchar(32)
-) */;
+) ENGINE=MyISAM */;
 DROP TABLE IF EXISTS `v2`;
 /*!50001 DROP VIEW IF EXISTS `v2`*/;
 /*!50001 CREATE TABLE `v2` (
   `a` int(11),
   `b` varchar(32),
   `c` varchar(32)
-) */;
+) ENGINE=MyISAM */;
 
 USE `test`;
 /*!50001 DROP TABLE `v0`*/;
@@ -3198,7 +3198,7 @@ DROP TABLE IF EXISTS `v1`;
 /*!50001 DROP VIEW IF EXISTS `v1`*/;
 /*!50001 CREATE TABLE `v1` (
   `id` int(11)
-) */;
+) ENGINE=MyISAM */;
 
 USE `mysqldump_test_db`;
 /*!50001 DROP TABLE `v1`*/;
@@ -3246,7 +3246,7 @@ CREATE DATABASE /*!32312 IF NOT EXISTS*/ `mysqldump_views` /*!40100 DEFAULT CHAR
 USE `mysqldump_views`;
 /*!50001 CREATE TABLE `nasishnasifu` (
   `id` bigint(20) unsigned
-) */;
+) ENGINE=MyISAM */;
 
 USE `mysqldump_tables`;