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Fix integer overflow in arrayIntersect.

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This commit is contained in:
Nikolai Kochetov 2019-11-14 12:46:10 +03:00
parent f2bbfd995a
commit 5440700299
1 changed files with 12 additions and 1 deletions
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13
dbms/src/Functions/array/arrayIntersect.cpp
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@ -436,7 +436,17 @@ ColumnPtr FunctionArrayIntersect::execute(const UnpackedArrays & arrays, Mutable
typename Map::mapped_type * value = nullptr;
if constexpr (is_numeric_column)
value = &map[columns[arg]->getElement(i)];
{
auto element = columns[arg]->getElement(i);
/// Do nothing in case of integer overflow. It happen if narrower type is used for the result.
/// E.g. arrayIntersect([-100], [156]) is (Array(Int8), Array(UInt8)) -> Array(UInt8)
/// and static_cast<UInt8>(-100) is 156 which is != -100. Without this check the result is [156].
if (element != static_cast<typename ColumnType::value_type>(element))
continue;
value = &map[element];
}
else if constexpr (std::is_same<ColumnType, ColumnString>::value || std::is_same<ColumnType, ColumnFixedString>::value)
value = &map[columns[arg]->getDataAt(i)];
else
@ -445,6 +455,7 @@ ColumnPtr FunctionArrayIntersect::execute(const UnpackedArrays & arrays, Mutable
value = &map[columns[arg]->serializeValueIntoArena(i, arena, data)];
}
/// Here we count the number of element appearances, but no more than once per array.
if (*value == arg)
++(*value);
}