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#include <Common/assert_cast.h>
#include <Interpreters/NullableUtils.h>
namespace DB
{
ColumnPtr extractNestedColumnsAndNullMap(ColumnRawPtrs & key_columns, ConstNullMapPtr & null_map)
{
ColumnPtr null_map_holder;
if (key_columns.size() == 1)
{
auto & column = key_columns[0];
if (const auto * column_nullable = checkAndGetColumn<ColumnNullable>(*column))
{
null_map_holder = column_nullable->getNullMapColumnPtr();
null_map = &column_nullable->getNullMapData();
column = &column_nullable->getNestedColumn();
}
}
else
{
for (auto & column : key_columns)
{
if (const auto * column_nullable = checkAndGetColumn<ColumnNullable>(*column))
{
column = &column_nullable->getNestedColumn();
if (!null_map_holder)
{
null_map_holder = column_nullable->getNullMapColumnPtr();
}
else
{
MutableColumnPtr mutable_null_map_holder = IColumn::mutate(std::move(null_map_holder));
PaddedPODArray<UInt8> & mutable_null_map = assert_cast<ColumnUInt8 &>(*mutable_null_map_holder).getData();
const PaddedPODArray<UInt8> & other_null_map = column_nullable->getNullMapData();
for (size_t i = 0, size = mutable_null_map.size(); i < size; ++i)
mutable_null_map[i] |= other_null_map[i];
null_map_holder = std::move(mutable_null_map_holder);
}
}
}
null_map = null_map_holder ? &assert_cast<const ColumnUInt8 &>(*null_map_holder).getData() : nullptr;
}
return null_map_holder;
}
}
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