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omnigraph/docs/user/errors.md
Ragnor Comerford 2d5c4b1202
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docs: rename runs.md/runs.rs → writes and repoint all references (#131) 
The Run state machine was removed in MR-771 (v0.4.0); `docs/dev/runs.md`
and `crates/omnigraph/tests/runs.rs` have since documented and tested the
direct-publish write path, so the "runs" name was misleading.

- git mv docs/dev/runs.md → docs/dev/writes.md (reframe H1 + intro;
  keep MR-771 history note)
- git mv crates/omnigraph/tests/runs.rs → tests/writes.rs (reframe header)
- repoint every runs.md / runs.rs reference across docs, AGENTS.md, and
  source comments
- fix four pre-existing broken `docs/runs.md` links (the file never lived
  at that path) to `docs/dev/writes.md`
- fix the stale v0.4.0 anchor to the live section

No behavior change: every source edit is a comment. Engine builds and the
renamed test passes 25/25; scripts/check-agents-md.sh passes.

The run-removal cleanup itself (run_registry.rs guard, __run__ prefix) is
deferred to MR-770.
2026-05-30 23:20:56 +02:00

1.9 KiB
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Errors and Result Serialization

Error taxonomy (omnigraph::error::OmniError)

  • Compiler(...) — schema/query parse/typecheck errors
  • Lance(String) — storage layer
  • DataFusion(String) — execution layer
  • Io(io::Error)
  • Manifest(ManifestError { kind: BadRequest|NotFound|Conflict|Internal, details: Option<ManifestConflictDetails>, … })
    • ManifestConflictDetails::ExpectedVersionMismatch { table_key, expected, actual } — caller's expected_table_versions did not match the manifest's current latest non-tombstoned version (set by OmniError::manifest_expected_version_mismatch).
    • ManifestConflictDetails::RowLevelCasContention — Lance row-level CAS rejected the publish because a concurrent writer landed the same object_id. Retried internally by the publisher; only surfaces if the retry budget exhausts.
    • D₂ parse-time rejection (MR-794): a single mutation query that mixes inserts/updates with deletes errors out before any I/O with kind BadRequest. Message: mutation '<name>' on the same query mixes inserts/updates and deletes; split into separate mutations: (1) inserts and updates, then (2) deletes. See docs/user/query-language.md for the rule and docs/dev/writes.md for the underlying staged-write rationale.
  • MergeConflicts(Vec<MergeConflict>)

Compiler-side NanoError covers parse / catalog / type / storage / plan / execution / arrow / lance / IO / manifest / unique-constraint, each with structured spans (SourceSpan { start, end }) for ariadne-style diagnostics.

Result serialization (omnigraph_compiler::result::QueryResult)

  • to_arrow_ipc() — efficient binary
  • to_sdk_json() — JS-safe JSON (large i64 wrapped in metadata)
  • to_rust_json() — Rust-friendly JSON
  • batches() — direct Arrow RecordBatch access

Mutation results: { affectedNodes: usize, affectedEdges: usize } (also exposed as a tiny Arrow batch).