FA-45380 / Data systems / Member archive

Row-dependent projection is evaluated only against the first row · case 05

Row-dependent projection is evaluated only against the first row.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Evaluate projection expressions over row IDs. Expressions are [kind,key] with stable, volatile, or row. A deterministic counter starts at seed and increments on each stable first call or volatile call; stable calls cache by key for the whole query. Row expressions return the current row ID. Preserve expression and row order.

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
row-dependent	`[[9], [9]]`	`[[9], [2]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.