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Doc: document libpq's restriction to INT_MAX rows in a PGresult.
As long as PQntuples, PQgetvalue, etc, use "int" for row numbers, we'repretty much stuck with this limitation. The documentation formerly statedthat the result of PQntuples "might overflow on 32-bit operating systems",which is just nonsense: that's not where the overflow would happen, andif you did reach an overflow it would not be on a 32-bit machine, becauseyou'd have OOM'd long since.Discussion:https://postgr.es/m/CA+FnnTxyLWyjY1goewmJNxC==HQCCF4fKkoCTa9qR36oRAHDPw@mail.gmail.com1 parentbc95e58 commit941e47f
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