protected virtual DbGroupExpressionBinding VisitGroupExpressionBinding(DbGroupExpressionBinding binding) { var result = binding; if (binding != null) { var newInput = VisitExpression(binding.Expression); if (!ReferenceEquals(binding.Expression, newInput)) { result = CqtBuilder.GroupBindAs(newInput, binding.VariableName, binding.GroupVariableName); RebindVariable(binding.Variable, result.Variable); RebindVariable(binding.GroupVariable, result.GroupVariable); } } return(result); }