1 files changed, 22 insertions, 0 deletions
diff --git a/db/migrate/20201120125953_replace_unused_labels_index.rb b/db/migrate/20201120125953_replace_unused_labels_index.rb
new file mode 100644
index 00000000000..afddbce618d
--- /dev/null
+++ b/db/migrate/20201120125953_replace_unused_labels_index.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class ReplaceUnusedLabelsIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  NEW_INDEX_NAME = 'index_labels_on_group_id_and_title_with_null_project_id'
+  OLD_INDEX_NAME = 'index_labels_on_group_id_and_title'
+
+  def up
+    add_concurrent_index :labels, [:group_id, :title], where: 'project_id IS NULL', name: NEW_INDEX_NAME
+    remove_concurrent_index_by_name :labels, OLD_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :labels, [:group_id, :title], where: 'project_id = NULL::integer', name: OLD_INDEX_NAME
+    remove_concurrent_index_by_name :labels, NEW_INDEX_NAME
+  end
+end