You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: column.go
    path of file: ./repos/yao/importer
    
    the code of the file until where you have to start completion: package importer

import (
	"fmt"
	"strings"

	jsoniter "github.com/json-iterator/go"
)

// MarshalJSON for json marshalJSON
func (column Column) MarshalJSON() ([]byte, err
    
func (column *Column) UnmarshalJSON(source []byte) error {
	var data = map[string]interface{}{}
	err := jsoniter.Unmarshal(source, &data)
	if err != nil {
		return err
	}

	new, err := ColumnOf(data)
	if err != nil {
		return err
	}

	*column = *new
	return nil
}