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Fuzzer, UBSan, statistical functions, PODArray, memcpy called with zero size and nullptr. #18525

@alexey-milovidov

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@alexey-milovidov
SELECT roundBankers(mannWhitneyUTest('greater')(left, right).1, 16) as t_stat, roundBankers(mannWhitneyUTest('greater')(left, right).2, 16) as p_value FROM mann_whitney FORMAT TabSeparatedWithNames;

https://clickhouse-test-reports.s3.yandex.net/18488/1ddea6d7eed5cadce087cf19e51413440571a472/stress_test_(undefined)/stderr.log

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fuzzProblem found by one of the fuzzersminorPriority: minor

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