Determinations of rows scanned from disk for a table scan

For table scans, the optimizer does not need to estimate the number of rows that will be scanned from disk during the scan; the number of rows that will be scanned from disk will be equal to the number of rows in the table, as described below.

Related concepts
Estimations of rows scanned from disk for an index scan
Statistics-based versus hard-wired selectivity
What are cardinality statistics?
Working with cardinality statistics