S3选择无效路径组件

Question

我试图弄清楚如何使用AWS S3 Select，一切看起来都很直接，但是下面的查询就是不想工作：

select r.value from S3Object[*].outputs.private_subnets r

以上返回Invalid Path component.

这是我正在使用的JSON：

{
    "outputs": {
        "private_subnets": {
            "value": [
                "subnet-1",
                "subnet-2",
                "subnet-3"
            ],
            "type": [
                "tuple",
                [
                    "string",
                    "string",
                    "string"
                ]
            ]
        },
        "public_subnets": {
            "value": [
                "subnet-1",
                "subnet-2",
                "subnet-3"
            ],
            "type": [
                "tuple",
                [
                    "string",
                    "string",
                    "string"
                ]
            ]
        },
        "vpc_id": {
            "value": "vpc-123",
            "type": "string"
        }
    }
}

我只是不明白这个错误，value在SQL中是一个特殊的词吗？

到目前为止，我尝试过的是：

select r from S3Object[*].outputs.private_subnets r

{
    "r": {
        "value": [
            "subnet-1",
            "subnet-2",
            "subnet-3"
        ],
        "type": [
            "tuple",
            [
                "string",
                "string",
                "string"
            ]
        ]
    }
}

select r.type from S3Object[*].outputs.private_subnets r

{
    "type": [
        "tuple",
        [
            "string",
            "string",
            "string"
        ]
    ]
}

所以我不明白value有什么问题。

Answer 1

您无法选择此值，因为"value“是保留关键字。https://docs.aws.amazon.com/AmazonS3/latest/dev/s3-glacier-select-sql-reference-keyword-list.html。这可以使用值周围的双引号转义。