HeliosDB Full v7.1.0 Release Notes

Release Date: 2026-01 (per Cargo.toml workspace package comment) Theme: Quantum optimizer Tier-1 safe integration

Highlights

v7.1.0 lands the first production-safe integration of the quantum-inspired query optimizer (heliosdb-research/quantum-optimizer). The integration is gated behind a fallback-only mode by default — Tier-1 means “ship it, but never let it break a query plan that the classical optimizer can already produce.”

What’s New

Quantum Optimizer Tier-1 Safe Integration

Tunables raised to production-realistic settings:

complexity_threshold raised to 10 joins (was 5) — quantum path now triggers only on genuinely complex plans where classical search becomes expensive.
annealing_iterations: 50 online / 500 batch (was 1,000 in both) — drastically lower steady-state CPU cost on the online path.
OLAP workload gating added — quantum search runs only on plans tagged as analytical, never on OLTP point-lookups.
Grover’s search disabled pending a rewrite. The QAOA path remains active.
Fallback-only mode is the default: if quantum search returns a worse plan than the classical baseline, the planner silently uses the classical plan.

Production Safety Posture

Quantum optimizer never replaces a hot path that already converges classically.
Telemetry hooks expose quantum_attempts, quantum_wins, quantum_fallbacks, and quantum_mean_speedup via the standard observability stack (Prometheus + OTel).
Operators can disable the quantum path entirely with --no-quantum-optimizer without losing any other v7.1 changes.

Migration

Drop-in. v7.1.0 is wire-compatible with v7.0.x. The quantum optimizer is on by default in fallback-only mode — no configuration is required to upgrade.

To opt out:

heliosdb-full --no-quantum-optimizer

To verify the optimizer is operational:

SHOW QUANTUM OPTIMIZER;

Compatibility Matrix

Component	Version
PostgreSQL wire	v3
MySQL wire	v10
Wire-compatible source revs	v7.0.x → v7.4.x
Build (minimal)	Rust 1.85+
Build (`research` feature)	Rust 1.85+, optional CUDA / ROCm SDK
Crate count	193

See CHANGELOG.md for the workspace-level entry.