---
phase: 13-type-mapping-and-property-based-tests-for-typed-column-dispatch
verified_by: gsd-verifier
date: 2026-03-02
result: PASS
---

# Phase 13 Verification

## Phase Goal

Replace the VARCHAR-cast intermediary with direct binary chunk reads per type, fixing TIMESTAMP all-NULL, BOOLEAN UB, and DECIMAL/LIST-as-string bugs, and validate the full typed output pipeline with property-based tests.

## Verification Results

### Plan 13-01: Binary-read dispatch pipeline

| Check | Result |
|-------|--------|
| `build_varchar_cast_sql` deleted | PASS — only appears in a doc comment |
| `parse_typed_from_str` deleted | PASS — only appears in a doc comment |
| `date_str_to_epoch_days` deleted | PASS — not found in codebase |
| `read_typed_from_vector` present (3 matches: comment + call + definition) | PASS |
| `duckdb_decimal_width/scale` in bind() path | PASS |
| TypedValue has Bool, I8, I16, U8, U16, U32, U64, F32, I128, List variants | PASS |
| `cargo test` — 93 lib tests pass | PASS |
| `cargo clippy -- -D warnings` — 0 warnings | PASS |

### Plan 13-02: output_proptest.rs

| Check | Result |
|-------|--------|
| `tests/output_proptest.rs` exists | PASS — 666 lines |
| All 36 output_proptest tests pass | PASS |
| TIMESTAMP NULL regression: `unit_tests::timestamp_returns_non_null` | PASS |
| BOOLEAN UB regression: `unit_tests::boolean_reads_correctly` | PASS |
| DECIMAL integration: `decimal_roundtrip` | PASS |
| LIST(BIGINT) integration: `list_bigint_roundtrip` | PASS |
| NULL propagation: `null_propagation` | PASS |
| Full `cargo test` — 136 total tests (93 + 6 + 36 + 1) | PASS |

### Phase-level success criteria

| Criterion | Result |
|-----------|--------|
| Binary-read dispatch replaces VARCHAR-cast intermediary | PASS |
| TIMESTAMP all-NULL bug fixed | PASS (verified by `timestamp_returns_non_null` + `timestamp_column_roundtrip`) |
| BOOLEAN UB bug fixed | PASS (verified by `boolean_reads_correctly` + `boolean_column_roundtrip`) |
| DECIMAL/LIST declared correctly at bind time | PASS (bind() runs LIMIT-0 for complex types) |
| `cargo test` passes with no regressions | PASS — 136 total, 0 failures |
| `cargo clippy -- -D warnings` — 0 warnings | PASS |

## Conclusion

Phase 13 is **COMPLETE**. All goals achieved, all tests pass, no regressions.
