问题 I am very beginner to AWS DynamoDB, I want to scan the DynamoDB with SENDTO.emailAddress = "first@first.com" as FilterExpression. The DB Structure looks like this { ID NAME MESSAGE SENDTO[ { name emailAddress } ] } A Sample Data { ID: 1, NAME: "HELLO", MESSAGE: "HELLO WORLD!", SENDTO: [ { name: "First", emailAddress: "first@first.com" }, { name: "Second", emailAddress: "second@first.com" } ] } I want to retrieve document that match emailAddress. I tried to scan with filter expression and here