Rikard Pavelic <rikard.pave...@zg.htnet.hr> writes:
> It would be great if Postgres could rewrite this query

AFAICS those queries are not going to produce the same results,
so Postgres would be 100% incorrect to rewrite it like that for you.

(If they do produce the same results, it would depend on a bunch
of assumptions you have not stated.)

                        regards, tom lane

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