On 25/10/2013 11:06, Albe Laurenz wrote: > Just because there is an entry in the index does not imply that the > corresponding table entry is visible for this transaction. > To ascertain that, the table row itself has to be checked.
Understood. > PostgreSQL 9.2 introduced "index only scan" which avoids that > additional step if it is safe to do so. It doesn't help in this case - the plan for the same query on a copy of the database on 9.3 is exactly the same.
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