refactor(parquet): one accessor family decodes for both readers - #757
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Epic #745 wave 2 slice A part 1: the line-for-line twin required_*/ optional_* accessors, the view-tolerant StrCol/BinCol wrappers, and the §3.8/§3.9 baseline-column check unify in decode.rs, generic over a two-constructor DecodeError trait implemented by ReaderError and AuditReaderError — the divergence class that produced the audit Utf8View bug (#746) structurally ends: a fix lands once or not at all, and both readers' diagnostics are built from one text. Reader- specific decode (scope attributes, the record/event assemblers) stays in each reader. One deliberate seam kept: the audit reader's historical absent-column-as-empty-vec shape for the hash column is an explicit unwrap_or_default at its one call site. -694 lines of twins replaced by one ~520-line shared module. Behavior identical: parquet 172 passed (same as baseline), querier 260 (RFC0005.2/.3/.4 compat trio, RFC 0009 suite incl. rfc0009_6 cross-amendment merge, rfc0042_8 re-projection all green). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JZXtbyWoQY19ZGtNecDfgv Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
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📝 WalkthroughWalkthroughThe PR adds a shared Parquet decoding module with common accessors and error handling. Both data and audit readers use the shared accessors and baseline-column validation. The audit reader preserves an empty vector for absent triggering line hashes. ChangesShared Parquet decoding
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This refactor centralizes Parquet decoding while preserving reader-specific validation and behavior; no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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🟢 Approval recommended
The changes are a mechanical unification with no confirmed correctness regressions, and the only findings are small doc/perf nits with straightforward fixes.
Pull request overview
This PR refactors ourios-parquet’s decode/accessor logic by introducing a single shared accessor family (decode.rs) used by both the data Reader and the AuditReader, aiming to eliminate line-for-line “twin” accessor drift (notably the prior Utf8View divergence).
Changes:
- Introduces
crates/ourios-parquet/src/decode.rs, a shared module providingrequired_*/optional_*accessors, view-tolerantStrCol/BinCol, and the baseline required-column check via a genericDecodeErrortrait. - Updates
reader.rsandaudit_reader.rsto use the shared decode/accessor module and shared baseline schema check. - Wires the new module into the crate via
lib.rs(mod decode;).
File summaries
| File | Description |
|---|---|
| crates/ourios-parquet/src/reader.rs | Switches data reader to shared decode/accessors and shared baseline-column check. |
| crates/ourios-parquet/src/audit_reader.rs | Switches audit reader to shared decode/accessors; keeps historical absent-column behavior for triggering_line_hash via unwrap_or_default. |
| crates/ourios-parquet/src/lib.rs | Adds the new internal decode module. |
| crates/ourios-parquet/src/decode.rs | New shared decoding/accessor implementation and error-construction trait for both readers. |
Review details
- Files reviewed: 4/4 changed files
- Comments generated: 2
- Review effort level: Lite
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JZXtbyWoQY19ZGtNecDfgv Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
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🟡 Changes recommended
require_baseline_columns’s doc comment references the wrong RFC section (§3.7 instead of §3.9/§3.8), which should be corrected to avoid future confusion.
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Review details
- Files reviewed: 4/4 changed files
- Comments generated: 1
- Review effort level: Lite
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Actionable comments posted: 1
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Inline comments:
In `@crates/ourios-parquet/src/decode.rs`:
- Around line 85-99: Add colocated tests in the decode module for
require_baseline_columns: use proptest to cover required-column presence and
rejection when required columns are absent or nullable, and add direct cases
confirming absent optional columns are accepted and view-array wrappers preserve
the expected behavior. Keep the tests adjacent to the implementation and reuse
existing schema/array test utilities where available.
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crates/ourios-parquet/src/audit_reader.rscrates/ourios-parquet/src/decode.rscrates/ourios-parquet/src/lib.rscrates/ourios-parquet/src/reader.rs
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Review round: the baseline check, null-on-required rejection with file-global row indices, absent-optional shapes (None vs the audit- historical empty vec) and type-mismatch conversion errors get direct cases beside the shared module, each pinned through both error types where the seam matters. The section citation reads §3.9 (reader contract) with §3.8 as policy. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JZXtbyWoQY19ZGtNecDfgv Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
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🟢 Approval recommended
The change is a behavior-preserving refactor with tests, and the only requested follow-ups are minor documentation clarifications.
Review details
Suppressed comments (2)
Previously missed (1) — in code that hasn't changed since the last review.
crates/ourios-parquet/src/decode.rs:455
- The doc comment for
optional_u64doesn’t mention that a missing column decodes to an emptyVec(not a per-rowNone/Somevector). Since this is a shared accessor, that subtle shape difference is easy to misuse; please document the absent-column behavior explicitly here.
This issue also appears on line 473 of the same file.
/// Per-row `Option<u64>` for a nullable `UInt64` column (the §3.7
/// `template_id` / `compaction_generation` / `compaction_rows`
/// columns).
pub(crate) fn optional_u64<E: DecodeError>(
crates/ourios-parquet/src/decode.rs:474
- Similarly,
optional_u32returns an emptyVecwhen the column is absent; documenting this prevents callers from assuming the returned vector always hasbatch.num_rows()entries.
/// Per-row `Option<u32>` for a nullable `UInt32` column.
pub(crate) fn optional_u32<E: DecodeError>(
- Files reviewed: 4/4 changed files
- Comments generated: 0 new
- Review effort level: Lite
… writers (#758) * refactor(parquet): shared BufferedParquetWriter core for data + audit writers The data writer and the audit writer were lifecycle twins: buffer rows into an in-memory ArrowWriter in sub-batches with a §3.5 flush threshold, poison on Parquet failure, publish via one store `put` on close. The twin halves (`append_chunks`, `close`, the object-key construction, the local-store scaffolding, the poisoning docs) drifted independently. New `parquet_io.rs` owns that lifecycle once: - `WriteError` ctor trait (mirrors decode.rs's `DecodeError`) so one core serves both public error enums. - `write_chunked` — the shared sub-batch loop, also backing the one-shot `encode_records_to_parquet`. Its `ChunkError` splits failures by origin, making the poison-on-Parquet-only rule structural instead of a `matches!` at every caller. - `BufferedParquetWriter` — inner/store/key/final_path/num_rows/ flush_bytes/poisoned + open/append/close; `Writer` and `AuditWriter` keep what actually differs (schema, props, encoder, partition pre-check, result type). Behavior is unchanged: same key shapes, same error variants, same poisoning and atomicity contracts, same flush thresholds (data 1024 rows / adaptive bytes, audit 256 rows / 128 MiB). Four colocated tests pin the core's invariants (key shape, publish + counts, encode errors don't poison, Parquet errors poison append and close). Verified: fmt, clippy -D warnings, ourios-parquet 180/180 (176 baseline + 4 new), compaction/rfc0009/rfc0005/rfc0042_8 filter 67/67, ourios-ingester suite green. Wave 2 of #745 (parquet slice A, writer half; decode half was #757). Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org> * refactor(parquet): error-trait impls live next to their error enums Review feedback on the writer core: parquet_io.rs hosted the WriteError impls for both writers' error enums, so the shared core depended back on the concrete writers. Each enum now implements the trait next to its own definition (writer.rs / audit_writer.rs), and the same move is applied to decode.rs's DecodeError impls (reader.rs / audit_reader.rs) so the two shared modules follow one rule: the core defines the trait, each consumer plugs in without editing the core. Pure code motion — no behavior change; parquet 180/180 unchanged. Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org> --------- Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
Epic #745, wave 2, slice A part 1 — the decode half of the twin unification (the shared
BufferedParquetWriterfollows separately).The line-for-line twin
required_*/optional_*accessors, the view-tolerantStrCol/BinColwrappers, and the §3.8/§3.9 baseline-column check unify indecode.rs, generic over a two-constructorDecodeErrortrait implemented by both reader errors. The divergence class that produced the auditUtf8Viewbug (#746) structurally ends: an accessor fix lands once or not at all, and both readers' diagnostics come from one text. Reader-specific decode (scope-attribute JSON, the record/event assemblers) stays where it was. One deliberate seam: the audit reader's historical absent-column-→-empty-vec shape for the hash column is an explicitunwrap_or_defaultat its single call site rather than a semantic change.−694 lines of twins → one ~520-line shared module. Gates all green and counts conserved: parquet 172 passed (RFC0005.2/.3/.4 compat trio, RFC 0009 suite including
rfc0009_6's cross-amendment merge,rfc0042_8re-projection), querier 260, workspace clippy-D warnings, fmt. No intended behavior change — the Utf8View acceptance already landed via #746's sharedStrCol.🤖 Generated with Claude Code
https://claude.ai/code/session_01JZXtbyWoQY19ZGtNecDfgv
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