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Hi,
Key deletion in DynamoDB means complete removal, as you suggest. Global secondary indexes can be deleted (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GSI.OnlineOps.html#GSI.OnlineOps.Deleting).
Regarding partition and sort keys, they cannot be changed/deleted, so you ll need create a new table with new keys.
Hope it clarifies and great English by the way ;)