首先，要使用GCP数据存储器查询实现比较，需要安装Google Cloud SDK和Python。

然后，需要创建3个实体类，包括User、Recipe和Ingredient，以展示不同的查询：

from google.cloud import datastore

class User:
    def __init__(self, client, name, email):
        self.client = client
        self.name = name
        self.email = email
        self.key = client.key("User", email)

    def save(self):
        entity = datastore.Entity(key=self.key)
        entity.update({"name": self.name, "email": self.email})
        self.client.put(entity)

class Recipe:
    def __init__(self, client, name, user_email):
        self.client = client
        self.name = name
        self.user_email = user_email
        self.key = client.key("Recipe", name)

    def save(self):
        entity = datastore.Entity(key=self.key)
        entity.update({"name": self.name, "user_email": self.user_email})
        self.client.put(entity)

class Ingredient:
    def __init__(self, client, name, recipe_name, recipe_user_email):
        self.client = client
        self.name = name
        self.recipe_name = recipe_name
        self.recipe_user_email = recipe_user_email
        self.key = client.key("Ingredient", name)

    def save(self):
        entity = datastore.Entity(key=self.key)
        entity.update({
            "name": self.name,
            "recipe_name": self.recipe_name,
            "recipe_user_email": self.recipe_user_email
        })
        self.client.put(entity)

接下来，需要对数据进行填充。我们是在测量查询性能，因此无需关心每个实体的字段在实战中意味着什么。

def fill_datastore(n_users, n_recipes, n_ingredients):
    client = datastore.Client()
    for i in range(n_users):
        user = User(client, f"User-{i}", f"user-{i}@example.com")
        user.save()
        for j in range(n_recipes):
            recipe = Recipe(client, f"Recipe-{i}-{j}", user