ClickHouse/dbms/src/Interpreters/NullableUtils.cpp

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#include <Interpreters/NullableUtils.h>
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namespace DB
{
void extractNestedColumnsAndNullMap(ConstColumnPlainPtrs & key_columns, ColumnPtr & null_map_holder, ConstNullMapPtr & null_map)
{
if (key_columns.size() == 1)
{
auto & column = key_columns[0];
if (!column->isNullable())
return;
const ColumnNullable & column_nullable = static_cast<const ColumnNullable &>(*column);
null_map = &column_nullable.getNullMap();
column = column_nullable.getNestedColumn().get();
}
else
{
PaddedPODArray<UInt8> * mutable_null_map = nullptr;
for (auto & column : key_columns)
{
if (column->isNullable())
{
const ColumnNullable & column_nullable = static_cast<const ColumnNullable &>(*column);
column = column_nullable.getNestedColumn().get();
if (!null_map_holder)
{
null_map_holder = column_nullable.getNullMapColumn()->clone();
mutable_null_map = &static_cast<ColumnUInt8 &>(*null_map_holder).getData();
}
else
{
const PaddedPODArray<UInt8> & other_null_map = column_nullable.getNullMap();
for (size_t i = 0, size = mutable_null_map->size(); i < size; ++i)
(*mutable_null_map)[i] |= other_null_map[i];
}
}
}
null_map = mutable_null_map;
}
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}
}