instance method retryable_query_error?

# File activerecord/lib/active_record/connection_adapters/abstract_adapter.rb, line 1142
        def retryable_query_error?(exception)
          # We definitely can't retry if we were inside an invalidated transaction.
          return false if current_transaction.invalidated?

          exception.is_a?(Deadlocked) || exception.is_a?(LockWaitTimeout)
        end