Heikki Linnakangas <[EMAIL PROTECTED]> writes:
> I wonder if calling RelationGetNumberOfBlocks on every seq scan becomes 
> a performance issue for tiny tables with for example just 1 page. It 
> performs an lseek, which isn't free.

We do that anyway; but certainly Simon's patch ought not be injecting
an additional one.

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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