Tom Lane wrote:
Not too many releases ago, there were several columns in pg_proc that
were intended to support estimation of the runtime cost and number of
result rows of set-returning functions.  I believe in fact that these
were the remains of Joe Hellerstein's thesis on expensive-function

FYI, Hellerstein's thesis on xfunc optimization is available here:

There's also a paper on this subject by Hellerstein that was published in Transactions on Database Systems:

I haven't had a chance to digest either one yet, but it might be worth a look.


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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match

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