hardOpenAI

Build an in-memory SQL-like table: schema and select → WHERE → combined && / || clauses → ORDER BY

The other OpenAI signature build, reported in four parts for two years. Part C silently punishes anyone who hardcoded single-condition filtering in part B; here's the predicate-compiler design that absorbs all four parts.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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