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In the wake of commit 80aa9848b, a few compilers think that postgresAcquireSampleRowsFunc's "reltuples" might be used uninitialized. The logic is visibly correct, both before and after that change; presumably what happened here is that the previous presence of a setjmp() in the function stopped them from attempting any flow analysis at all. Add a dummy initialization to silence the warning. Reported-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAExHW5tkerCufA_F6oct5dMJ61N+yVrVgYXL7M8dD-5_zXjrDw@mail.gmail.com