Pig 默认 JsonLoader 架构问题 [英] Pig default JsonLoader schema issue

问题描述

我有以下需要使用 Pig 解析的数据

I've the below data that need to be parsed using Pig

数据

{
    "Name": "BBQ Chicken",
    "Sizes": [
        { "Size": "Large", "Price": 14.99 },
        { "Size": "Medium", "Price": 12.99 }
    ],
    "Toppings": [ "Barbecue Sauce", "Chicken", "Cheese" ]
}

我能够为 Name 和 Sizes 定义架构，但我无法让 Toppings 工作.在此处寻求帮助.

I am able to define the schema for Name and Sizes but I couldn't get the Toppings working. Looking for some help here.

脚本

data = LOAD '/user/hue/data/nested_json_pizza_sample_data.json'
       USING JsonLoader('Name:chararray,
                         Sizes:bag{tuple(Size:chararray, Price:float)},
                         Toppings:tuple(a:chararray)');
DUMP data;

输出

如下所示，Topping 的数据没有被解析.

As you can see below, the Topping's data is not being parsed.

(BBQ Chicken,{(Large,14.99),(Medium,12.99)},)
(Hawaiian,{(Large,12.99),(Medium,10.99)},)
(Vegetable,{(Large,12.99),(Medium,10.99)},)
(Pepperoni,{(Large,12.99),(Medium,10.99),(Small,7.49)},)
(Cheese,{(Large,10.99),(Medium,9.99),(Small,5.49)},)
data: {Name: chararray,Sizes: {(Size: chararray,Price: float)},Toppings: (a: chararray)}

推荐答案

这里有两个选项:如果数组中的项数未知.

You have two options here : if the number of items in the array in unknown.

Toppings:{t:(i:chararray)}

或者如果元素数量始终相同.

Or if the number of elements going to be same allways.

Toppings: (i: chararray, j: chararray, k: chararray)

会给你输出:

(BBQ Chicken,{(Large,14.99),(Medium,12.99)},)

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