According to the DynamoDBMapper documentation in the AWS Java SDK, the save method of the DynamoDBMapper class, takes a config (of DynamoDBMapperConfig type) as one of the inputs.
In the documentation (link) the following has been provided as the explanation for the UPDATE config.
UPDATE (default) : UPDATE will not affect unmodeled attributes on a save operation and a null value for the modeled attribute will remove it from that item in DynamoDB. Because of the limitation of updateItem request, the implementation of UPDATE will send a putItem request when a key-only object is being saved, and it will send another updateItem request if the given key(s) already exists in the table.
I am unable to understand this. What does this config mean? Can someone explain it in simple terms?
