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docs: 2026-04-28 upstream survey — three SPEC-changing pivots

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Pre-Phase-G0 research sweep against current Go ecosystem state. Three
upstream changes that the day-of SPEC missed:

1. DuckDB Go binding ownership transferred. marcboeker/go-duckdb is
   deprecated as of v2.5.0 — official maintainer is now
   github.com/duckdb/duckdb-go/v2 (DuckDB team + Marc Boeker joint
   hand-off). Current v2.10502.0 / DuckDB v1.5.2. SPEC §3.1 +
   component table updated.

2. Official Go MCP SDK exists. Switching from mark3labs/mcp-go
   (community) to github.com/modelcontextprotocol/go-sdk (official,
   Google collaboration, v1.5.0 stable, 4.4k stars, targets MCP spec
   2025-11-25). Component table updated.

3. arrow-go is on v18, not v15. v18.5.2 (March 2026) has parquet
   encryption fixes relevant for PII-masked safe views. PRD locked
   stack + SPEC component table updated.

Validated unchanged: coder/hnsw (220 stars, active), chi (still the
clean-architecture pick over fiber/gin/echo).

Surfaced for future use: anthropics/anthropic-sdk-go (official,
available for direct Claude calls bypassing opencode if ever needed),
duckdb-wasm (browser-side analytics future option), IVF as HNSW
fallback if recall gate fails.

See docs/RESEARCH_LOG_2026-04-28.md for full survey + sources.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
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2026-04-28 06:40:26 -05:00
co-authored by Claude Opus 4.7
parent f07668064e
commit 29468b1413
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@@ -39,7 +39,7 @@ is an explicit re-platforming, not a refactor.
| HTTP gateway | Axum + Tokio | `net/http` + `chi` (or `gin`) | High — Go's bread and butter |
| gRPC | tonic | `google.golang.org/grpc` | High — Go is the reference impl |
| Object store | Apache Arrow `object_store` | `aws-sdk-go-v2/service/s3` + thin wrapper | High |
| Parquet I/O | parquet-rs (arrow-rs) | `apache/arrow-go/v15/parquet` | Medium — arrow-go lags arrow-rs but covers our needs |
| Parquet I/O | parquet-rs (arrow-rs) | `apache/arrow-go/v18/parquet` | Medium — arrow-go lags arrow-rs but v18 covers our needs |
| Query engine | DataFusion | **Hard problem** (see §Hard problems) | Low — no like-for-like Go equivalent |
| Vector index (HNSW) | `hora` / hand-rolled | `coder/hnsw` or `Bithack/go-hnsw` (in-process) | High — HNSW is a self-contained algorithm |
| Vector backend (Lance) | `lance` (Rust) | **Hard problem** — likely dropped, Parquet-only | Medium |
@@ -76,7 +76,7 @@ binaries built from one workspace.
| gRPC | `google.golang.org/grpc` | Reference implementation |
| Protobuf | `protoc-gen-go` + `buf` | Standard tooling |
| Object store | `aws-sdk-go-v2` | Mature, covers S3 + MinIO + RustFS |
| Parquet | `apache/arrow-go/v15` | Columnar I/O + Arrow interop |
| Parquet | `apache/arrow-go/v18` | Columnar I/O + Arrow interop (v18.5.2 — March 2026) |
| SQL engine | **Open** — see §Hard problems §1 | Biggest open decision |
| Vector index | `coder/hnsw` | Pure-Go HNSW, in-process, no external service |
| TOML config | `pelletier/go-toml/v2` | Standard |