docs(readme): add DeltaGraph / Databricks mention#341
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DeltaGraph (Databricks SQL Warehouse support) is the headline 0.6.7-dev feature but had zero README coverage — visitors hitting the repo landing page had no signal it exists, and the "What's New" section for 0.6.7-dev only mentioned the embedded writes work. Adds: - "What's New in v0.6.7-dev" bullet covering the full scope (dialect routing, executor, embedded/FFI/`cg` surfaces, `deltagraph` server binary, YAML catalog field) and the pending items. - A top-level Features entry alongside Embedded Mode and Remote Mode, pointing at the QUICKSTART for the manual walkthrough. No code changes; CHANGELOG / STATUS / QUICKSTART already covered this feature — this just makes the README the same source of truth. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Pull request overview
This PR updates the README to surface DeltaGraph / Databricks SQL Warehouse support as a v0.6.7-dev feature and core capability.
Changes:
- Adds a detailed DeltaGraph bullet under “What’s New in v0.6.7-dev”.
- Adds DeltaGraph to the “Core Capabilities” feature list with a quickstart link.
| - **Stateless Architecture** - Offloads all query execution to ClickHouse; no extra datastore required | ||
| - **Embedded Mode** - In-process graph queries over Parquet/Iceberg/Delta/S3 via chdb; no ClickHouse server needed (`--features embedded`) | ||
| - **Remote Mode** - Cypher translated locally, executed against external ClickHouse — no chdb required (`Database::new_remote`) | ||
| - **DeltaGraph (Databricks SQL Warehouse)** - Cypher translated to Spark SQL locally and executed against a Databricks SQL Warehouse via the Statement Execution API. Opt-in `--features databricks`; ships the `deltagraph` server binary, `cg --dialect databricks`, and `Database::new_databricks` for embedded/FFI callers. See [docs/deltagraph/QUICKSTART.md](docs/deltagraph/QUICKSTART.md). |
Address PR #341 Copilot review: the feature-list entry said `Database::new_databricks` for both embedded and FFI callers, but the FFI surface is `Database::open_databricks` (see clickgraph-ffi/ src/lib.rs). Conflating them would send Go/Python users to a nonexistent constructor. Now matches the split already used in the "What's New" bullet on line 21. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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- PR provenance: align with CHANGELOG (engineering PRs #316–#338, follow-ups #339/#340/#341 noted separately) instead of claiming the full range was all engineering work - Correctness gate + exit criterion: exclude bi-16 explicitly (blocked on CALL subqueries; was an impossible gate as written) - MERGE: move out of "explicitly out of scope" into a should-land-before-GA bullet, matching STATUS.md / CHANGELOG.md which both list MERGE as pending before Databricks GA. Flag the QUICKSTART wording mismatch for reconciliation when MERGE lands. - Local-dataset seeding: point at benchmarks/ldbc_snb/schemas/ for the actual LDBC label set; clarify that social_benchmark.yaml is dev-only sanity coverage, not LDBC Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
cgsurfaces,deltagraphserver binary, YAMLcatalog:field, and the pending items (MERGE, OAuth M2M, full LDBC, external-link result chunks).docs/deltagraph/QUICKSTART.md.Test plan
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