code: func (exp *PrefixedExp) String() string {
  	if exp.AfterPrefix == nil {
  		return exp.Prefix
  	}
  
  	if exp.Prefix == "FROM" && len(exp.Binding) > 0 {
  		return exp.Prefix + " " + EntityTableName(exp.Binding[0]) + " " + ExpsToString(exp.AfterPrefix)
  	}
  
  	return exp.Prefix + " " + ExpsToString(exp.AfterPrefix)
  }
docs: // String returns Prefix + " " + AfterPrefix.