将SQL查询结果存储并格式化为GO中的关联数组

Question

我有一个SQL查询来获取列的所有不同值

SELECT DISTINCT ON (column1) column1, column2, column3, column4 FROM table1 WHERE column1=$1

现在我要做的是生成这样的响应：

{
 "column1" : ["value1", "value2", "value3", "value4"],
 "column2" : ["value1", "value2", "value3", "value4"],
...
}

我遇到的问题是如何将查询结果扫描到结果图中：

rows, err = sql.DB.Query("SELECT DISTINCT ON (column1) column1, column2, column3, column4 FROM table1 WHERE column1=$1", id)

if err != nil {
  return err
}

defer rows.Close()

result := make(map[string][]string)
cols,_ := rows.Columns()

for _, colName := range cols {
    result[colName] = []string{}
}

for rows.Next() {

        columns := make([]interface{}, len(cols))
        columnPointers := make([]interface{}, len(cols))

        for i := range columns {
            columnPointers[i] = &columns[i]
        }

        if err := rows.Scan(columnPointers...); err != nil {
            return result, err
        }

        for i, colName := range cols {

            val := columns[i]

            if val != nil {
                if val.(string) != "" {
                    result[colName] = append(params[colName], val.(string))
                }
            }

        }
    }

return result, nil

编辑：感谢question from @Arne，我得以弄清楚。使用完整的工作版本更新了我的问题。