ResearchResearch paperReasoning & Planning1 source · Oct 11, 2026

Passing Tests, Missing Semantics: Evidence of Interpretive Lock-In in Plan-Based DataFrame Code Generation

We investigate this risk on 30 DataFrame tasks derived from TPC Benchmark DS, comparing Frozen One-Pass, Test-Guided Revision, and PlanAudit-Guided Revision.

Key points

  • Planning and revision are intended to bring generated code closer to the task specification.
  • Yet a mistaken interpretation can persist across the plan, implementation, and tests - a pattern we call interpretive lock-in.
  • Same-engine SQL re-execution reproduced 28/30 references; all 77 test-passing runs on these tasks still failed reference agreement.
  • Fresh generation on ten targeted tasks produced 0/30 reference matches and 25/25 false passes among test-passing runs.

Sources (1)

Extractive summary: sentences quoted from the sources.

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