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This was referenced Nov 14, 2026
Extract a focused piece from the metadata table implementation with its tests. Co-authored-by: Codex <codex@openai.com>
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Depends on #1120 (scan contracts/tasks), #1133 (lazy Arrow batching), #1134 (partition values), and #1135 (live-file iteration). Apply those prerequisites when building this draft; merge them first, then rebase this branch onto main. This table is independent of FilesTable and ManifestsTable.
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PartitionsTablethroughTable::Inspect(MetadataTableKind::kPartitions). Aggregate live data/delete files by projected partition values and expose record/file counts, data-file sizes, spec IDs, and last-update metadata.Scans retain metadata/projection/FileIO and support whole-column projection and configurable batches. Aggregation unifies evolved partition specs, canonicalizes NaNs, and preserves signed zeros. Mutex-protected schema caches retain ownership safely during concurrent builder creation. Manifest reads select only fields required for aggregation.
The shared scan test fixture accompanies its real consumers; identical copies in the other table drafts disappear on rebase once the fixture lands.
Validation with the helper prerequisites applied: all 95 metadata tests and C++20 compatibility passed. Feature-specific code and factory were compiled and linked against the separately built helper foundation. Pre-commit and clang-tidy 22.1.8 passed.