Module build_cache 

Content-addressed build cache — V12-Spike-2.

Maps body_hash (SHA-256 of source text) to compiled artifacts. If a CodeNode’s body hasn’t changed, its compiled output is reusable.

Architecture

CodeNode.body_hash ──► BuildCache lookup
                           ├── hit  → return cached artifact (skip compilation)
                           └── miss → compile → store artifact → return

The cache is backed by an Arrow RecordBatch, persisted to Parquet. This is a spike — validating that content addressing gives >90% cache hits on real NuSy development before committing to the full V13 build.

Modules

artifact_col

Column indices for the build artifacts table.

Structs

BuildCache

Content-addressed build cache backed by Arrow.

CacheEntry

A single cached build artifact.

CacheStats

Cache performance statistics.

CommitPairMeasurement

Measurement between two consecutive commits.

CrateDeps

Crate dependency graph for transitive invalidation analysis.

DepAwareMeasurement

Per-commit dependency-aware measurement.

DependencyAwareReport

Result of dependency-aware cache analysis.

HashStabilityReport

Result of measuring hash stability across git commits.

Functions

build_artifacts_schema

Schema for the build artifacts cache table.

collect_file_hashes

Collect file hashes for a single git commit.

measure_dep_aware_stability

Measure dependency-aware cache hit rates across git history.

measure_hash_stability

Measure hash stability across recent git commits.

recent_commits

Get the last N commit hashes from git log.