Re: [PATCH v4] write-tree: integrate with sparse index

> Shuqi Liang wrote:
>> Update 'git write-tree' to allow using the sparse-index in memory
>> without expanding to a full one.
>> 
>> The recursive algorithm for update_one() was already updated in 2de37c5
>> (cache-tree: integrate with sparse directory entries, 2021-03-03) to
>> handle sparse directory entries in the index. Hence we can just set the
>> requires-full-index to false for "write-tree".
>> 
>> The `p2000` tests demonstrate a ~96% execution time reduction for 'git
>> write-tree' using a sparse index:
>> 
>> Test                                           before  after
>> -----------------------------------------------------------------
>> 2000.78: git write-tree (full-v3)              0.34    0.33 -2.9%
>> 2000.79: git write-tree (full-v4)              0.32    0.30 -6.3%
>> 2000.80: git write-tree (sparse-v3)            0.47    0.02 -95.8%
>> 2000.81: git write-tree (sparse-v4)            0.45    0.02 -95.6%
>
> Please update your commit message to explain only the incremental updates on
> top of 1a65b41b38a (write-tree: integrate with sparse index, 2023-04-03);
> that patch's message (what you have here) does not accurately describe what
> _this_ patch is doing.