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Merge pull request #6937 from amosbird/ubmemfix

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In hash tables, properly initialize zero key cell.
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akuzm 2019-09-17 14:57:38 +03:00 committed by GitHub
commit 75dc7d331e
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3 changed files with 14 additions and 2 deletions
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14
dbms/src/Common/HashTable/HashTable.h
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@ -224,8 +224,18 @@ private:
public:
bool hasZero() const { return has_zero; }
void setHasZero() { has_zero = true; }
void clearHasZero() { has_zero = false; }
void setHasZero()
{
has_zero = true;
new (zeroValue()) Cell();
}
void clearHasZero()
{
has_zero = false;
zeroValue()->~Cell();
}
Cell * zeroValue() { return reinterpret_cast<Cell*>(&zero_value_storage); }
const Cell * zeroValue() const { return reinterpret_cast<const Cell*>(&zero_value_storage); }

1
dbms/tests/queries/0_stateless/01011_group_uniq_array_memsan.reference Normal file
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@ -0,0 +1 @@
[[],[2]]

1
dbms/tests/queries/0_stateless/01011_group_uniq_array_memsan.sql Normal file
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@ -0,0 +1 @@
select groupUniqArray(v) from values('id int, v Array(int)', (1, [2]), (1, [])) group by id;