code: func (visitor *findEntityVisitor) VisitPrefixedExp(exp *sql.PrefixedExp) {
  	if exp.Prefix == "FROM" {
  		if len(exp.Binding) == 1 && r.Indirect(r.ValueOf(exp.Binding[0])).Kind() == r.Struct {
  			visitor.entity = exp.Binding[0]
  		}
  	} else if exp.AfterPrefix != nil {
  		for _, exp := range exp.AfterPrefix {
  			exp.Accept(visitor)
  		}
  	}
  }
docs: // VisitPrefixedExp checks for "FROM" expression to find out the entity