使用自定义类型在Golang中解析JSON数组

我正在try 用Golang解析一个json数组，格式如下:

[
  {
    "table1": [
      { "name": "col1", "type": "string"},
      { "name": "col2", "type": "int"},
    ]
  },
  {
    "table2": [
       { "name": "col3", "type": "string"},
       { "name": "col4", "type": "int"},
    ]
  },
  {
    "table3": [
      ...
    ]
  }
]

例如，json应该包含不同表的模式. 我try 了以下代码，但架构返回空:

package main

import (
    "encoding/json"
    "io"
    "log"
    "os"
)

type ColumnType struct {
    Name  string `json:"name"`
    Type  string `json:"type"`
}

type Schema struct {
    Schema map[string][]ColumnType
}

func main() {

    mocksSchemas, _ := os.Open("parse_config/mock_schema.json")

    var schemas []Schema
    content, err := io.ReadAll(mocksSchemas)
    if err != nil {
        log.Fatal("Error when reading mock file: ", err)
    }
    err = json.Unmarshal(content, &schemas)
    if err != nil {
        log.Fatal("Error during Unmarshal(): ", err)
    }

    defer mocksSchemas.Close()
}

我做错了什么？如果能帮我指出我的错误，我将不胜感激 谢谢!