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Partition injection sorts requested result columns · case 04

Partition injection sorts requested result columns.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Read ordered file fragments [partition-values,physical-rows] under a projection of field names. Partition values override stale physical columns of the same name; unprojected fields disappear, missing fields become None, and physically empty fragments do not synthesize rows.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
partition overrides	`[["new", 4]]`	`[[4, "new"]]`	Failed

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