1 files changed, 21 insertions, 0 deletions
diff --git a/db/migrate/20200928164807_add_index_on_vulnerabilities_state_case.rb b/db/migrate/20200928164807_add_index_on_vulnerabilities_state_case.rb
new file mode 100644
index 00000000000..7bfae7377d7
--- /dev/null
+++ b/db/migrate/20200928164807_add_index_on_vulnerabilities_state_case.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class AddIndexOnVulnerabilitiesStateCase < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_vulnerabilities_on_state_case_id'
+  STATE_ORDER_ARRAY_POSITION = 'ARRAY_POSITION(ARRAY[1, 4, 3, 2]::smallint[], state)'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :vulnerabilities, "#{STATE_ORDER_ARRAY_POSITION}, id DESC", name: INDEX_NAME
+    add_concurrent_index :vulnerabilities, "#{STATE_ORDER_ARRAY_POSITION} DESC, id DESC", name: "#{INDEX_NAME}_desc"
+  end
+
+  def down
+    remove_concurrent_index_by_name :vulnerabilities, "#{INDEX_NAME}_desc"
+    remove_concurrent_index_by_name :vulnerabilities, INDEX_NAME
+  end
+end