[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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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