Removing alloc on all .next() in MultiValueColumn

[fulmicoton]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1594 (7baa6e3) into main (0dc8c45) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1594   +/-   ##
=======================================
  Coverage   93.74%   93.75%           
=======================================
  Files         251      252    +1     
  Lines       46279    46324   +45     
=======================================
+ Hits        43386    43432   +46     
+ Misses       2893     2892    -1     

Impacted Files	Coverage Δ
src/indexer/mod.rs	100.00% <ø> (ø)
src/indexer/flat_map_with_buffer.rs	100.00% <100.00%> (ø)
src/indexer/sorted_doc_id_multivalue_column.rs	95.38% <100.00%> (-0.21%)	⬇️
src/schema/mod.rs	100.00% <0.00%> (ø)
src/schema/text_options.rs	100.00% <0.00%> (ø)
src/core/inverted_index_reader.rs	72.86% <0.00%> (ø)
src/postings/stacker/expull.rs	99.05% <0.00%> (+0.47%)	⬆️

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[PSeitz]

Awesome solution. I'll push a change to the branch to make it as ergonomic as flat_map