private async Task ExecuteSetExpr(SetExpr expr) { var key = new ORSetKey <string>(expr.Key); try { var set = await ddata.GetAsync(key) ?? ORSet <string> .Empty; switch (expr.Symbol) { case Symbol.ADD: set = set.Add(cluster, expr.Value); break; case Symbol.REM: set = set.Remove(cluster, expr.Value); break; default: throw new NotSupportedException($"Operation {expr.Symbol} not supported on ORSet"); } await ddata.UpdateAsync(key, set, writeConsistency); var value = await ddata.GetAsync(key); Console.WriteLine($"Updated '{key}': {value}"); } catch (Exception e) { Console.WriteLine($"Couldn't perform UPDATE for {key}: {e}"); } }