Fix a formatting bug and add a test for it.

sql/share/errmsg.txt

@@ -5355,6 +5355,6 @@ ER_BINLOG_CREATE_ROUTINE_NEED_SUPER
 ER_EXEC_STMT_WITH_OPEN_CURSOR
 	eng "You can't execute a prepared statement which has an open cursor associated with it. Reset the statement to re-execute it."
 ER_STMT_HAS_NO_OPEN_CURSOR
-	eng "The statement (%d) has no open cursor."
+	eng "The statement (%lu) has no open cursor."
 ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG
         eng "Explicit or implicit commit is not allowed in stored function or trigger."

sql/sql_prepare.cc

@@ -2209,7 +2209,7 @@ void mysql_stmt_fetch(THD *thd, char *packet, uint packet_length)
 
   if (!stmt->cursor || !stmt->cursor->is_open())
   {
-    my_error(ER_STMT_HAS_NO_OPEN_CURSOR, MYF(0));
+    my_error(ER_STMT_HAS_NO_OPEN_CURSOR, MYF(0), stmt_id);
     DBUG_VOID_RETURN;
   }
 

tests/mysql_client_test.c

@@ -12995,6 +12995,19 @@ static void test_bug9478()
     rc= mysql_stmt_fetch(stmt);
     DIE_UNLESS(rc == MYSQL_NO_DATA);
 
+    {
+      char buff[8];
+      /* Fill in the fethc packet */
+      int4store(buff, stmt->stmt_id);
+      buff[4]= 1;                               /* prefetch rows */
+      rc= ((*mysql->methods->advanced_command)(mysql, COM_STMT_FETCH, buff,
+                                               sizeof(buff), 0,0,1) ||
+           (*mysql->methods->read_query_result)(mysql));
+      DIE_UNLESS(rc);
+      if (!opt_silent && i == 0)
+        printf("Got error (as expected): %s\n", mysql_error(mysql));
+    }
+
     rc= mysql_stmt_execute(stmt);
     check_execute(stmt, rc);
 
@@ -13039,7 +13052,7 @@ static void test_bug9478()
       /* Fill in the execute packet */
       int4store(buff, stmt->stmt_id);
       buff[4]= 0;                               /* Flag */
-      int4store(buff+5, 1);                     /* Return 1 row */
+      int4store(buff+5, 1);                     /* Reserved for array bind */
       rc= ((*mysql->methods->advanced_command)(mysql, COM_STMT_EXECUTE, buff,
                                                sizeof(buff), 0,0,1) ||
            (*mysql->methods->read_query_result)(mysql));