Bug#18129 - Fast (online) add index leaves temporary table frm in case of errors

ALTER TABLE temporarily creates a new table with a .frm
file and optionally other files. For fast ALTER TABLE
only the .frm file is created. If the operation succeeds,
The temporary files are renamed to their final target.

In case of an error, the temporary file was forgotten to
remove.

Manually tested. The test requires to look at files,
which I think cannot be done portably with the test suite.
The test file is attached to the bug report.

sql/sql_table.cc

@@ -4738,10 +4738,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
       new_table=open_temporary_table(thd, path, new_db, tmp_name,0);
     }
     if (!new_table)
-    {
-      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
-      goto err;
-    }
+      goto err1;
   }
 
   /* Copy the data if necessary. */
@@ -4794,7 +4791,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
               table->file->create_handler_files(path, create_info));
       VOID(pthread_mutex_unlock(&LOCK_open));
       if (error)
-        goto err;
+        goto err1;
 #endif
 
       /* The add_index() method takes an array of KEY structs. */
@@ -4822,7 +4819,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
         table->key_info= key_info;
         table->file->print_error(error, MYF(0));
         table->key_info= save_key_info;
-        goto err;
+        goto err1;
       }
     }
     /*end of if (index_add_count)*/
@@ -4840,7 +4837,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
               table->file->create_handler_files(path, create_info));
       VOID(pthread_mutex_unlock(&LOCK_open));
       if (error)
-        goto err;
+        goto err1;
 
       if (! need_lock_for_indexes)
       {
@@ -4874,7 +4871,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
                                                   index_drop_count)))
       {
         table->file->print_error(error, MYF(0));
-        goto err;
+        goto err1;
       }
 
 #ifdef XXX_TO_BE_DONE_LATER_BY_WL3020
@@ -4902,7 +4899,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
       if ((error= table->file->final_drop_index(table)))
       {
         table->file->print_error(error, MYF(0));
-        goto err;
+        goto err1;
       }
     }
     /*end of if (index_drop_count)*/
@@ -4915,7 +4912,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
     /* Need to commit before a table is unlocked (NDB requirement). */
     DBUG_PRINT("info", ("Committing before unlocking table"));
     if (ha_commit_stmt(thd) || ha_commit(thd))
-      goto err;
+      goto err1;
     committed= 1;
   }
   /*end of if (! new_table) for add/drop index*/
@@ -4924,17 +4921,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
   {
     /* We changed a temporary table */
     if (error)
-    {
-      /*
-	The following function call will free the new_table pointer,
-	in close_temporary_table(), so we can safely directly jump to err
-      */
-      if (new_table)
-        close_temporary_table(thd, new_table, 1, 1);
-      else
-        VOID(quick_rm_table(new_db_type,new_db,tmp_name));
-      goto err;
-    }
+      goto err1;
     /* Close lock if this is a transactional table */
     if (thd->lock)
     {
@@ -4945,16 +4932,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
     close_temporary_table(thd, table, 1, 1);
     /* Should pass the 'new_name' as we store table name in the cache */
     if (rename_temporary_table(thd, new_table, new_db, new_name))
-    {						// Fatal error
-      if (new_table)
-      {
-        close_temporary_table(thd, new_table, 1, 1);
-        my_free((gptr) new_table,MYF(0));
-      }
-      else
-        VOID(quick_rm_table(new_db_type,new_db,tmp_name));
-      goto err;
-    }
+      goto err1;
     /* We don't replicate alter table statement on temporary tables */
     if (!thd->current_stmt_binlog_row_based)
       write_bin_log(thd, TRUE, thd->query, thd->query_length);
@@ -5169,6 +5147,15 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
   thd->some_tables_deleted=0;
   DBUG_RETURN(FALSE);
 
+ err1:
+  if (new_table)
+  {
+    /* close_temporary_table() frees the new_table pointer. */
+    close_temporary_table(thd, new_table, 1, 1);
+  }
+  else
+    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
+
  err:
   DBUG_RETURN(TRUE);
 }