At 11:13 AM 25/04/2003 -0400, Tom Lane wrote:
>The point is that the system *may* choose to evaluate f() only once,
>not that it *must* do so. The classification exists to make it valid
>to use an indexscan on "col".
So just for my own understanding, the optimizer does not know that it can
treat a STABLE function f as constant inside an outer loop of t1 in this query:
select * from t1,t2 where t2.f1 = f(t1.f1)
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