Fix overflow danger in SampleHeapTupleVisible(), take 2
28328ec87b45725 addressed one overflow danger in
SampleHeapTupleVisible() but introduced another, albeit a less likely
one. Modify the binary search code to remove this danger.
Reported-by: Richard Guo
Reviewed-by: Richard Guo, Ranier Vilela
Discussion: https://postgr.es/m/CAMbWs4_bE%2BNscChbKWzw6HZOipCUyXfA5133qvoXQ654D3B2gQ%40mail.gmail.com