Further Model Size Reductions

[josephbirkner]

Changes:

• Reduce ObjectField size from 8B to 6B (skip padding) by introducing TwoPart<First, Second> storage support for ModelColumn/ArrayArena.
• ArrayArena can store fixed-size one-element arrays without chunk-data overhead. Saves ~10% on array/object/geometry storage.

Benchmark results:

branch                         big-model-query-perf (s) 
------                         ------------------------  
main                           147.77
v0.6.3                         135.53
noserde                        139.22
feature/singleton-arrays       137.75
feature/split-field-storage    139.55

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[github-actions]

Test Results

 1 files  ±0   1 suites  ±0   6m 51s ⏱️ -1s
91 tests +3  91 ✅ +3  0 💤 ±0  0 ❌ ±0 
96 runs  +3  96 ✅ +3  0 💤 ±0  0 ❌ ±0 

Results for commit 9a3911b. ± Comparison against base commit e9c17b1.

♻️ This comment has been updated with latest results.

[johannes-wolf]

How does TwoPart<A, B> (aka. std::pair?) reduce the size of structs? This is a lot of changes and it is hard to tell how the size-optimization happens.
Both fields of a TwoPart<A, B> are stored in separate containers to skip field padding.

[johannes-wolf]

I think we need to acquire a write lock here.

[johannes-wolf]

Remove this duplicate.

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

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[github-actions]

Package	Line Rate	Branch Rate	Health
include.simfil	24%	10%	❌
include.simfil.model	75%	46%	➖
src	74%	46%	➖
src.model	82%	46%	✔
Summary	45% (7692 / 17020)	27% (4717 / 17367)	❌