Drop unused column

Summary: https://secure.phabricator.com/D1830?id=3203#inline-2058

Test Plan:
Run script on db containing this column.
Run script on db not containing this column.
Visit /repository/.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1854

resources/sql/patches/117.repositorydescription.php

@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+$conn = id(new PhabricatorRepository())->establishConnection('w');
+if (queryfx_one($conn, "SHOW COLUMNS FROM `repository` LIKE 'description'")) {
+  queryfx($conn, "ALTER TABLE `repository` DROP `description`");
+}