Vectorized hash grouping on one column

[akuzm]

some experiments

Parts:

• Vectorized aggregation with grouping by one fixed-size column #7341

[codecov]

Codecov Report

Attention: Patch coverage is 89.94709% with 57 lines in your changes missing coverage. Please review.

Project coverage is 82.59%. Comparing base (59f50f2) to head (4c71b9c).
Report is 548 commits behind head on main.

Files with missing lines	Patch %	Lines
tsl/src/import/ts_simplehash.h	83.21%	10 Missing and 14 partials ⚠️
tsl/src/nodes/vector_agg/grouping_policy_hash.c	90.18%	2 Missing and 14 partials ⚠️
tsl/src/nodes/vector_agg/hash_single_text.c	80.64%	3 Missing and 3 partials ⚠️
...l/src/nodes/vector_agg/hash_table_functions_impl.c	88.46%	2 Missing and 4 partials ⚠️
tsl/src/nodes/vector_agg/plan.c	71.42%	0 Missing and 4 partials ⚠️
tsl/src/nodes/vector_agg/single_fixed_key_impl.c	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7316      +/-   ##
==========================================
+ Coverage   80.06%   82.59%   +2.52%     
==========================================
  Files         190      236      +46     
  Lines       37181    43172    +5991     
  Branches     9450    10826    +1376     
==========================================
+ Hits        29770    35658    +5888     
- Misses       2997     3199     +202     
+ Partials     4414     4315      -99     

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