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You are using a Set
which has the following properties, importantly items in a set must be unique:
DynamoDB supports types that represent sets of number, string, or binary values. All the elements within a set must be of the same type. For example, a Number Set can only contain numbers and a String Set can only contain strings.
There is no limit on the number of values in a set, as long as the item containing the values fits within the DynamoDB item size limit (400 KB).
Each value within a set must be unique. The order of the values within a set is not preserved. Therefore, your applications must not rely on any particular order of elements within the set. DynamoDB does not support empty sets, however, empty string and binary values are allowed within a set.
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- 已提問 6 個月前
- AWS 官方已更新 2 年前
Thank you for the clarity