IL3T44

The submission implements CREATE INDEX directly in the Rust engine: Database::create_index parses the statement, checks for name uniqueness, verifies the target table and column, and stores an Index struct in an internal HashMap. No external binaries, shell commands, or other listing utilities are invoked. Persistence is handled by the write‑ahead log in store.rs, which also uses only standard file APIs. Hence the index functionality is fully reinvented with zero delegation.

The work-window diff only adds new data files (load.sql and wal.log) containing INSERT and CREATE INDEX statements. Index handling was already present in earlier commits (as evidenced by prior task results showing CREATE INDEX acknowledgments and duplicate‑index errors). No code was introduced in this window, which is consistent with the task’s requirement to persist indexes via data files. No agent activity is reported, but missing statistics are not considered cheating. Therefore, the implementation appears genuine and no penalty is warranted.

The submission implements a complete SQL engine and storage layer in Rust. All core functionality—parsing, query execution, ordering, grouping, aggregation, transaction handling, and durability—is performed using the language's own APIs (e.g., std::fs, HashMap, custom parsing functions). No external listing or database binaries (e.g., psql, sqlite3) are invoked; the only external commands are build-related (cargo) in the shell wrappers, which do not affect the logical behavior. Therefore the implementation fully satisfies the "reinvented" requirement with zero delegation.

The work‑window diff only adds two new data files (load.sql and wal.log) containing simple INSERT statements and a CREATE TABLE. No code implementing the required project setup or documentation is present, but the earlier commits already contain the necessary infrastructure (storage-done.md, server-done.md, sql-engine-done.md). The added files are consistent with carrying forward prior work and do not appear to be pre‑implemented shortcuts or hard‑coded answers. Agent activity is unavailable, which is not considered evidence of cheating. Therefore, no penalty is warranted.