---
phase: 19-parser-hook-validation-spike
verified: 2026-03-09T12:00:00Z
status: passed
score: 3/3 must-haves verified
re_verification: false
---

# Phase 19: Parser Hook Validation Spike — Verification Report

**Phase Goal:** Confirmed scope for v0.5.1 -- which DDL statements can use the parser fallback hook and which cannot
**Verified:** 2026-03-09
**Status:** PASSED
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths (from ROADMAP.md Success Criteria)

| #   | Truth                                                                                                         | Status     | Evidence                                                                                                  |
| --- | ------------------------------------------------------------------------------------------------------------- | ---------- | --------------------------------------------------------------------------------------------------------- |
| 1   | Each of the 7 DDL prefixes has been tested against DuckDB with the extension loaded                           | VERIFIED   | `test/sql/phase19_parser_hook_validation.test` passes via `just test-sql` — all 7 prefixes covered        |
| 2   | For each prefix, the error type is recorded: Parser Error (triggers hook) or Catalog Error (bypasses hook)    | VERIFIED   | `19-SPIKE-RESULTS.md` empirical table rows 1-7; 15 YES/NO occurrences confirmed via grep                  |
| 3   | A concrete scope decision is documented: which statements get native syntax in v0.5.1 and which remain function-only | VERIFIED   | `## Scope Decision` section present in SPIKE-RESULTS.md; decision is "all 7 prefixes use native syntax"   |

**Score:** 3/3 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
| -------- | -------- | ------ | ------- |
| `test/sql/phase19_parser_hook_validation.test` | Empirical proof all 7 DDL prefixes produce Parser Error (not Catalog Error) — must contain "DROP SEMANTIC VIEW" | VERIFIED (exists, substantive, wired) | 162 lines; covers all 7 prefixes with inline comments documenting expected error type and actual behavior; passes `just test-sql` |
| `.planning/phases/19-parser-hook-validation-spike/19-SPIKE-RESULTS.md` | Scope decision document for v0.5.1 DDL coverage — must contain "Scope Decision" | VERIFIED (exists, substantive, wired) | 112 lines; empirical results table with 7 rows, analysis section, scope decision, v0.5.1 DDL scope table, implementation notes for Phase 20 |

### Key Link Verification

| From | To | Via | Status | Details |
| ---- | -- | --- | ------ | ------- |
| `test/sql/phase19_parser_hook_validation.test` | `19-SPIKE-RESULTS.md` | Test results inform scope decision | VERIFIED | Test results match the SPIKE-RESULTS table exactly (e.g., Parser Error at "SEMANTIC" for prefixes 1-3, at "VIEW" for prefix 5, at "VIEWS" for prefix 6; prefix 4 creates view named "IF"); SPIKE-RESULTS conclusions are grounded in the test output |
| `test/sql/TEST_LIST` | `phase19_parser_hook_validation.test` | Test runner inclusion | VERIFIED | `test/sql/TEST_LIST` line 5: `test/sql/phase19_parser_hook_validation.test` — confirms test is executed by `just test-sql` |

### Requirements Coverage

Phase 19 has no formal requirement IDs. The PLAN frontmatter explicitly declares `requirements: []` and the ROADMAP entry states "Requirements: None (scope-determination phase; informs DDL-07, DDL-08 feasibility)." The REQUIREMENTS.md traceability table confirms all v0.5.1 requirements (DDL-03 through DDL-08) map to Phase 20, not Phase 19. There are no orphaned requirements for this phase.

| Requirement | Source Plan | Description | Status | Evidence |
| ----------- | ----------- | ----------- | ------ | -------- |
| (none) | 19-01-PLAN.md | Scope-determination spike; no requirements assigned | N/A | requirements: [] in PLAN frontmatter |

### Anti-Patterns Found

No anti-patterns detected.

| File | Line | Pattern | Severity | Impact |
| ---- | ---- | ------- | -------- | ------ |
| (none) | — | — | — | — |

Scan notes:
- `test/sql/phase19_parser_hook_validation.test`: No TODO/FIXME/placeholder. No empty implementations. The `statement ok` for prefix 4 (CREATE SEMANTIC VIEW IF NOT EXISTS) intentionally documents incorrect behavior (view named "IF") as an empirical finding, not a stub.
- `19-SPIKE-RESULTS.md`: No placeholder text. All {actual} template fields are filled with real error messages.

### Human Verification Required

None — all success criteria are machine-verifiable for a spike phase:

- Sqllogictest pass/fail is automated (confirmed: all 5 tests pass)
- Error type recording is observable in the test file and SPIKE-RESULTS table
- Scope decision completeness is checkable via section presence and content review

### Quality Gate

Per CLAUDE.md, all phases must pass `just test-all` before verification is marked complete.

| Test Suite | Command | Result |
| ---------- | ------- | ------ |
| Rust unit + proptest + doc tests | `cargo test` | PASSED (36 + 5 + 1 = 42 tests) |
| SQL logic tests | `just test-sql` | PASSED (5/5 tests including phase19) |
| DuckLake CI integration tests | `just test-ducklake-ci` | PASSED (6/6 tests) |

### Commits Verified

| Commit | Description | Verified |
| ------ | ----------- | -------- |
| `35b0941` | test(19-01): validate all 7 DDL prefixes trigger parser fallback hook | EXISTS in git log |
| `27c193c` | docs(19-01): document spike results and v0.5.1 scope decision | EXISTS in git log |

### Summary

Phase 19 achieved its goal. The spike produced empirical confirmation that all 7 DDL prefixes (`DROP SEMANTIC VIEW`, `DROP SEMANTIC VIEW IF EXISTS`, `CREATE OR REPLACE SEMANTIC VIEW`, `CREATE SEMANTIC VIEW IF NOT EXISTS`, `DESCRIBE SEMANTIC VIEW`, `SHOW SEMANTIC VIEWS`, `CREATE SEMANTIC VIEW`) trigger the parser fallback hook via Parser Errors (not Catalog Errors). The scope decision — full native DDL coverage for all 6 new requirements in Phase 20 — is concretely documented. The prefix overlap finding (`CREATE SEMANTIC VIEW IF NOT EXISTS` matching the shorter `CREATE SEMANTIC VIEW` prefix) is documented and generates a concrete implementation constraint for Phase 20 (longer prefixes must be checked first). The test suite passes in full with no regressions.

---

_Verified: 2026-03-09_
_Verifier: Claude (gsd-verifier)_
