v1, it contains 1GB, and in
v2, we replace the data with another 1GB of records, of which half of them overlap with
v1. In this scenario, while each version of the table is 1GB, the total storage of the dataset is only 1.5GB, since we have 0.5GB of overlap between each version. If
v1becomes inactive (while
v2stays active), only the 0.5GB of data unique to
v1will be marked as active.