MDL-59476 dml: temporary mysql tables should not use compressed rows

lib/ddl/mysql_sql_generator.php

@@ -329,13 +329,10 @@ class mysql_sql_generator extends sql_generator {
      * @return array of sql statements
      */
     public function getCreateTempTableSQL($xmldb_table) {
-        $engine = $this->mdb->get_dbengine();
         // Do we know collation?
         $collation = $this->mdb->get_dbcollation();
         $this->temptables->add_temptable($xmldb_table->getName());
 
-        $rowformat = $this->mdb->get_row_format_sql($engine, $collation);
-
         $sqlarr = parent::getCreateTableSQL($xmldb_table);
 
         // Let's inject the extra MySQL tweaks.
@@ -347,7 +344,7 @@ class mysql_sql_generator extends sql_generator {
                     if (strpos($collation, 'utf8_') === 0) {
                         $sqlarr[$i] .= " DEFAULT CHARACTER SET utf8";
                     }
-                    $sqlarr[$i] .= " DEFAULT COLLATE $collation $rowformat";
+                    $sqlarr[$i] .= " DEFAULT COLLATE $collation ROW_FORMAT=DYNAMIC";
                 }
             }
         }