a79b8ede88
the input replicate_offsets should be the same size as ColumnArray's offset. ``` IColumn::Offsets replicate_offsets(get_offsets().size(), 0); // |---------------------|-------------------------|-------------------------| // [0, begin) [begin, begin + count_sz) [begin + count_sz, size()) // do not need to copy copy counts[n] times do not need to copy ``` we should