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 v1
becomes inactive (while v2
stays active), only the 0.5GB of data unique to v1
will be marked as active.