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Fix generateUUIDv4

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This commit is contained in:
Alexey Milovidov 2021-05-04 20:47:35 +03:00
parent 617a58b857
commit a9a885bc43
1 changed files with 9 additions and 8 deletions
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17
src/Functions/generateUUIDv4.cpp
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@ -32,21 +32,22 @@ public:
ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
{
auto col_res = ColumnVector<UInt128>::create();
typename ColumnVector<UInt128>::Container & vec_to = col_res->getData();
auto col_res = ColumnVector<UUID>::create();
typename ColumnVector<UUID>::Container & vec_to = col_res->getData();
size_t size = input_rows_count;
vec_to.resize(size);
/// RandImpl is target-dependent and is not the same in different TargetSpecific namespaces.
RandImpl::execute(reinterpret_cast<char *>(vec_to.data()), vec_to.size() * sizeof(UInt128));
RandImpl::execute(reinterpret_cast<char *>(vec_to.data()), vec_to.size() * sizeof(UUID));
for (UInt128 & uuid: vec_to)
for (UUID & uuid : vec_to)
{
/** https://tools.ietf.org/html/rfc4122#section-4.4
*/
uuid.items[0] = (uuid.items[0] & 0xffffffffffff0fffull) | 0x0000000000004000ull;
uuid.items[1] = (uuid.items[1] & 0x3fffffffffffffffull) | 0x8000000000000000ull;
/// https://tools.ietf.org/html/rfc4122#section-4.4
UInt128 & impl = uuid.toUnderType();
impl.items[0] = (impl.items[0] & 0xffffffffffff0fffull) | 0x0000000000004000ull;
impl.items[1] = (impl.items[1] & 0x3fffffffffffffffull) | 0x8000000000000000ull;
}
return col_res;