fix: Fix compressed ndjson row count

[nameexhaustion]

re-opened, this time with 100% plaintext 😁

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.83%. Comparing base (69a2bef) to head (126bfd9).
Report is 73 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18371      +/-   ##
==========================================
- Coverage   79.84%   79.83%   -0.01%     
==========================================
  Files        1496     1496              
  Lines      200333   200336       +3     
  Branches     2841     2841              
==========================================
- Hits       159957   159948       -9     
- Misses      39851    39863      +12     
  Partials      525      525              

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[codspeed-hq]

CodSpeed Performance Report

Merging #18371 will improve performances by 40.3%

_{Comparing nameexhaustion:compressed-ndjson-count (126bfd9) with main (aa283e6)}

Summary

⚡ 1 improvements
✅ 36 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	nameexhaustion:compressed-ndjson-count	Change
⚡	test_groupby_h2oai_q4	2.6 ms	1.8 ms	+40.3%