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我想使用 AWS CDK 在我的 lambda 上启用 DynamoDB 流，我可以这样做，但我也想在 lambda 上启用过滤条件

但我收到此错误：

过滤器模式定义无效。（服务：AWSLambda；状态代码：400；错误代码：InvalidParameterValueException

这是我从 DynamoDB 流中收到的事件：

{
    "input": {
        "Records": [
            {
                "eventID": "e92e0072a661a06df0e62e411f",
                "eventName": "INSERT",
                "eventVersion": "1.1",
                "eventSource": "aws:dynamodb",
                "awsRegion": "<region>",
                "dynamodb": {
                    "ApproximateCreationDateTime": 1639500357,
                    "Keys": {
                        "service": {
                            "S": "service"
                        },
                        "key": {
                            "S": "key"
                        }
                    },
                    "NewImage": {
                        "service": {
                            "S": "service"
                        },
                        "channel": {
                            "S": "email"
                        },
                        "key": {
                            "S": "key"
                        }
                    },
                    "SequenceNumber": "711500000000015864417",
                    "SizeBytes": 168,
                    "StreamViewType": "NEW_IMAGE"
                },
                "eventSourceARN": "arn:aws:dynamodb:<region>:<account>:table/table-name/stream/2021-12-14T13:00:29.888"
            }
        ]
    },
    "env": …