perf: do not match each token in aggregation

[dkharms]

Description

When getting tokens for aggregation, we scan each token and checking it against * -- so basically, useless computations and IO (we have to load+unpack token blocks). I suggest to return range [firstTID; lastTID].

Obviously, this optimization will have more impact on high-cardinality fields that span over several token blocks (like remote_addr or something).

I will collect better measurements but for cold queries (flushed userspace cache and page cache) I got following results:

# query: * | group by (remote_addr) | count

# Before (restart seq-db, flush page cache)
% hyperfine -r=1 'curl --json @search.json http://localhost:9002/complex-search'
Benchmark 1: curl --json @search.json http://localhost:9002/complex-search
  Time (abs ≡):         2.561 s               [User: 0.003 s, System: 0.010 s]

% hyperfine -r=10 'curl --json @search.json http://localhost:9002/complex-search'
Benchmark 1: curl --json @search.json http://localhost:9002/complex-search
  Time (mean ± σ):      1.222 s ±  0.046 s    [User: 0.004 s, System: 0.006 s]
  Range (min … max):    1.163 s …  1.279 s    10 runs

# After (restart seq-db, flush page cache)
% hyperfine -r=1 'curl --json @search.json http://localhost:9002/complex-search'
Benchmark 1: curl --json @search.json http://localhost:9002/complex-search
  Time (abs ≡):         1.440 s               [User: 0.003 s, System: 0.010 s]

% hyperfine -r=10 'curl --json @search.json http://localhost:9002/complex-search'
Benchmark 1: curl --json @search.json http://localhost:9002/complex-search
  Time (mean ± σ):      1.208 s ±  0.051 s    [User: 0.004 s, System: 0.006 s]
  Range (min … max):    1.128 s …  1.277 s    10 runs

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.46%. Comparing base (4ad8f17) to head (20e3307).

Files with missing lines	Patch %	Lines
frac/processor/eval_tree.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
+ Coverage   70.44%   70.46%   +0.02%     
==========================================
  Files         232      232              
  Lines       18371    18384      +13     
==========================================
+ Hits        12942    12955      +13     
+ Misses       4453     4452       -1     
- Partials      976      977       +1     

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[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
Indexer-4	4ad8f1	900dcf
	677543019.00 B/op	771867370.00 B/op	1.14	🔴