Re: [I] Shrink residual Vec in split_vec_min_alloc to fix capacity-based memory accounting on long split_off chains [datafusion]

["mzabaluev (via GitHub)" <gi...@apache.org>]

mzabaluev commented on issue #22548:
URL: https://github.com/apache/datafusion/issues/22548#issuecomment-5045055191

   > A caller in `datafusion/physical-plan/src/aggregates/group_values/multi_group_by/bytes.rs` pushes onto the emitted prefix immediately after the call (`first_n_offsets.push(...)`); shrinking the prefix forces a realloc on the next push.
   
   This should be fixed by using a dedicated helper in #23730.


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