[jdbc.row] Reduce allocations in fetch-all-columns!

[alexander-yakushev]

This doesn't look much like an improvement but it actually removes two sources of allocations per each row – the LongRange and the lambda created by partial. This accounts for ~10% of allocations in my "select 10k rows" benchmark, and it costs nothing to optimize it (except maybe a bit of readability).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.59%. Comparing base (352d181) to head (b644d7b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   83.58%   83.59%   +0.01%     
==========================================
  Files          37       37              
  Lines        2497     2499       +2     
  Branches      212      212              
==========================================
+ Hits         2087     2089       +2     
  Misses        198      198              
  Partials      212      212              

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[camsaul]

Cool. Thanks for the explanation of the performance impact