1 files changed, 25 insertions, 0 deletions
diff --git a/db/migrate/20191204093410_add_label_project_group_partial_indexes.rb b/db/migrate/20191204093410_add_label_project_group_partial_indexes.rb
new file mode 100644
index 00000000000..85666144856
--- /dev/null
+++ b/db/migrate/20191204093410_add_label_project_group_partial_indexes.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddLabelProjectGroupPartialIndexes < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  PROJECT_AND_TITLE = [:project_id, :title]
+  GROUP_AND_TITLE = [:group_id, :title]
+
+  def up
+    add_concurrent_index :labels, PROJECT_AND_TITLE, unique: false, where: "labels.group_id = null"
+    add_concurrent_index :labels, GROUP_AND_TITLE, unique: false, where: "labels.project_id = null"
+  end
+
+  def down
+    remove_concurrent_index :labels, PROJECT_AND_TITLE
+    remove_concurrent_index :labels, GROUP_AND_TITLE
+  end
+end