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Fix UBSan report in runningDifference

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This commit is contained in:
Alexey Milovidov 2021-01-22 23:46:51 +03:00
parent 4afcb94a8a
commit 4047542b61
3 changed files with 3 additions and 1 deletions
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3
src/Functions/runningDifference.h
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@ -46,7 +46,7 @@ private:
/// It is possible to track value from previous columns, to calculate continuously across all columnss. Not implemented.
template <typename Src, typename Dst>
static void process(const PaddedPODArray<Src> & src, PaddedPODArray<Dst> & dst, const NullMap * null_map)
static NO_SANITIZE_UNDEFINED void process(const PaddedPODArray<Src> & src, PaddedPODArray<Dst> & dst, const NullMap * null_map)
{
size_t size = src.size();
dst.resize(size);
@ -76,6 +76,7 @@ private:
else
{
auto cur = src[i];
/// Overflow is Ok.
dst[i] = static_cast<Dst>(cur) - prev;
prev = cur;
}

0
tests/queries/0_stateless/01665_running_difference_ubsan.reference Normal file
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1
tests/queries/0_stateless/01665_running_difference_ubsan.sql Normal file
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@ -0,0 +1 @@
SELECT k, d, i FROM (SELECT t.1 AS k, t.2 AS v, runningDifference(v) AS d, runningDifference(cityHash64(t.1)) AS i FROM (SELECT arrayJoin([(NULL, 65535), ('a', 7), ('a', 3), ('b', 11), ('b', 2), ('', -9223372036854775808)]) AS t)) WHERE i = 9223372036854775807;