Special handling for dictionary-encoded text in vectorized grouping

[akuzm]

If we have a small dictionary, hashing its entries and then translating the key indexes to the actual rows will be faster.

[github-actions]

@fabriziomello, @erimatnor: please review this pull request.

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[codecov]

Codecov Report

Attention: Patch coverage is 80.61224% with 19 lines in your changes missing coverage. Please review.

Project coverage is 82.02%. Comparing base (5a51693) to head (8271e4d).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...des/vector_agg/hashing/hash_strategy_single_text.c	79.77%	6 Missing and 12 partials ⚠️
.../src/nodes/vector_agg/hashing/hash_strategy_impl.c	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8270      +/-   ##
==========================================
- Coverage   82.16%   82.02%   -0.14%     
==========================================
  Files         257      256       -1     
  Lines       48323    48643     +320     
  Branches    12189    12277      +88     
==========================================
+ Hits        39704    39899     +195     
- Misses       3741     3884     +143     
+ Partials     4878     4860      -18     

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[github-actions]

This pull request has been automatically marked as stale due to lack of activity. This pull request will be closed in 30 days.

[github-actions]

This pull request has been automatically marked as stale due to lack of activity. This pull request will be closed in 30 days.