1 files changed, 27 insertions, 0 deletions
diff --git a/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb b/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb
new file mode 100644
index 00000000000..b2009b282e9
--- /dev/null
+++ b/db/migrate/20170919211300_remove_temporary_ci_builds_index.rb
@@ -0,0 +1,27 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class RemoveTemporaryCiBuildsIndex < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # To use create/remove index concurrently
+  disable_ddl_transaction!
+
+  def up
+    return unless index_exists?(:ci_builds, :id, name: 'index_for_ci_builds_retried_migration')
+    remove_concurrent_index(:ci_builds, :id, name: "index_for_ci_builds_retried_migration")
+  end
+
+  def down
+    # this was a temporary index for a migration that was never
+    # present previously so this probably shouldn't be here but it's
+    # easier to test the drop if we have a way to create it.
+    add_concurrent_index("ci_builds", ["id"],
+                         name: "index_for_ci_builds_retried_migration",
+                         where: "(retried IS NULL)",
+                         using: :btree)
+  end
+end