Unsupported file format version error when opening a partially upgraded DuckDB file
When a DuckDB upgrade is interrupted, the database file can contain a mix of old and new page formats, causing later opens with an older binary to fail with an “unsupported file format version” error. The goal is to decide whether DuckDB should instead permit read‑only access to such a file, providing a graceful fallback for inspection or recovery. Constrain
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