Tablesample with proportion really constant time?

Posted Aug 7, 2015 15:29 UTC (Fri) by smurf (subscriber, #17840)
In reply to: Tablesample with proportion really constant time? by epa
Parent article: "Big data" features coming in PostgreSQL 9.5

AFAIU the random sampling itself (i.e. deciding which entries to take) would take const time. Retrieving the actual data, obviously not.