https://clickhouse-test-reports.s3.yandex.net/20492/c5b96a522e29b38eae3f6c2d945540dd234e3c34/fuzzer_msan/server.log

```
for i in {1..100}; do clickhouse-client --query "SELECT toUInt8(assumeNotNull(cast(cast(NULL, 'Nullable(String)'), 'Nullable(Enum8(\'Hello\' = 1))')))"; done

160
224
128
192
64
64
32
160
128
192
128
224
128
160
0
96
64
32
192
224
64
96
224
96
128
192
192
128
...
```
{
        return [element_wrappers = getElementWrappers(from_kv_types, to_kv_types), from_kv_types, to_kv_types]
            (ColumnsWithTypeAndName & arguments, const DataTypePtr &, const ColumnNullable * nullable_source, size_t ) -> ColumnPtr
        {
            const auto * col = arguments.front().column.get();
            const auto & column_tuple = assert_cast<const ColumnTuple &>(*col);
            Columns offsets(2);
            Columns converted_columns(2);
            for (size_t i = 0; i < 2; ++i)
            {
                const auto & column_array = assert_cast<const ColumnArray &>(column_tuple.getColumn(i));
                ColumnsWithTypeAndName element = {{column_array.getDataPtr(), from_kv_types[i], ""}};
                converted_columns[i] = element_wrappers[i](element, to_kv_types[i], nullable_source, (element[0].column)->size());
                offsets[i] = column_array.getOffsetsPtr();
            }
            const auto & keys_offsets = assert_cast<const ColumnArray::ColumnOffsets &>(*offsets[0]).getData();
            const auto & values_offsets = assert_cast<const ColumnArray::ColumnOffsets &>(*offsets[1]).getData();
            if (keys_offsets != values_offsets)
                throw Exception(ErrorCodes::TYPE_MISMATCH,
                    "CAST AS Map can only be performed from tuple of arrays with equal sizes.");
            return ColumnMap::create(converted_columns[0], converted_columns[1], offsets[0]);
        };
    }
    WrapperType createMapToMapWrrapper(const DataTypes & from_kv_types, const DataTypes & to_kv_types) const