**Describe the bug**
```
SELECT number % 100 AS k, sumArray(emptyArrayUInt8()) AS v FROM numbers(10) GROUP BY k
```
Fails under ASan.

}
    
    mapped = nullptr;
    if (exception)
        std::rethrow_exception(exception);
}
template <typename Method, typename Table>
void NO_INLINE Aggregator::convertToBlockImplFinal(
    Method & method,
    Table & data,
    MutableColumns & key_columns,
    MutableColumns & final_aggregate_columns,
    Arena * arena) const
{
    if constexpr (Method::low_cardinality_optimization)
    {
        if (data.hasNullKeyData())
        {
            key_columns[0]->insertDefault();
            insertAggregatesIntoColumns(data.getNullKeyData(), final_aggregate_columns, arena);
        }
    }
    data.forEachValue([&](const auto & key, auto & mapped)
    {
        method.insertKeyIntoColumns(key, key_columns, key_sizes);
        insertAggregatesIntoColumns(mapped, final_aggregate_columns, arena);
    });
}
template <typename Method, typename Table>
void NO_INLINE Aggregator::convertToBlockImplNotFinal(