1 files changed, 18 insertions, 0 deletions
diff --git a/db/post_migrate/20210506064413_create_namespaces_id_parent_id_inverse_partial_index.rb b/db/post_migrate/20210506064413_create_namespaces_id_parent_id_inverse_partial_index.rb
new file mode 100644
index 00000000000..151b0f64e80
--- /dev/null
+++ b/db/post_migrate/20210506064413_create_namespaces_id_parent_id_inverse_partial_index.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class CreateNamespacesIdParentIdInversePartialIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  NAME = 'index_namespaces_id_parent_id_is_not_null'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :namespaces, :id, where: 'parent_id IS NOT NULL', name: NAME
+  end
+
+  def down
+    remove_concurrent_index :namespaces, :id, name: NAME
+  end
+end