On Tue, 2007-29-05 at 16:01 -0400, Tom Lane wrote: > (I imagine someday we'll get around to allowing int8 to be pass-by-value > on 64-bit platforms.)
This could really be a significant performance win: I'm planning to take
a look at doing it for 8.4.
-Neil
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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
match
