---
phase: 34.1.1-close-gaps-with-snowflake-show-semantic-ddls-add-like-starts-with-limit
verified: 2026-03-22T18:30:00Z
status: passed
score: 8/8 must-haves verified
re_verification: false
---

# Phase 34.1.1: SHOW SEMANTIC FILTER CLAUSES Verification Report

**Phase Goal:** Close gaps with Snowflake SHOW SEMANTIC DDLs — add LIKE, STARTS WITH, LIMIT
**Verified:** 2026-03-22T18:30:00Z
**Status:** PASSED
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | SHOW SEMANTIC DIMENSIONS LIKE '%rev%' produces SQL with WHERE name ILIKE '%rev%' | VERIFIED | `rewrite_ddl` SHOW arm calls `parse_show_filter_clauses` then appends `build_filter_suffix`; unit test `test_rewrite_show_dims_like_cross_view` asserts exact SQL output |
| 2 | SHOW SEMANTIC METRICS STARTS WITH 'total' produces SQL with WHERE name LIKE 'total%' | VERIFIED | `build_filter_suffix` maps STARTS WITH to `name LIKE '{prefix}%'`; unit test `test_rewrite_show_metrics_starts_with_limit` asserts correct output |
| 3 | SHOW SEMANTIC FACTS LIMIT 5 produces SQL with LIMIT 5 | VERIFIED | `build_filter_suffix` appends `LIMIT {n}`; unit test `test_rewrite_show_facts_limit` and sqllogictest Test 11 verify end-to-end |
| 4 | All three clauses compose: LIKE + STARTS WITH + LIMIT in one statement | VERIFIED | `build_filter_suffix` accumulates all three; unit test `test_rewrite_show_dims_like_in_starts_with_limit` and sqllogictest Test 12 verify full composition |
| 5 | Clause order enforced: LIKE before IN, STARTS WITH after IN/FOR METRIC, LIMIT last | VERIFIED | `parse_show_filter_clauses` parses in strict order; `test_rewrite_show_dims_like_after_in_error` confirms wrong-order returns Err; sqllogictest Test 16 (statement error) |
| 6 | FOR METRIC variant supports LIKE, STARTS WITH, LIMIT | VERIFIED | `rewrite_ddl` FOR METRIC path calls same `build_filter_suffix`; unit test `test_rewrite_show_dims_for_metric_with_all_clauses` and sqllogictest Tests 13-15 verify |
| 7 | Both IN (single-view) and cross-view forms support all filter clauses | VERIFIED | `rewrite_ddl` branches on `clauses.in_view` then appends same suffix; sqllogictest Tests 1-12 cover both forms across all three entity types |
| 8 | Single quotes in patterns are properly escaped (SQL injection safe) | VERIFIED | `build_filter_suffix` calls `.replace('\'', "''")` on both LIKE and STARTS WITH patterns; unit test `test_build_filter_suffix_reescapes_quotes` and `test_extract_quoted_string_escaped_quotes` verify round-trip |

**Score:** 8/8 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/parse.rs` | `fn extract_quoted_string` | VERIFIED | Present at line 237; substantive implementation (22 lines with escape handling); called from `parse_show_filter_clauses` |
| `src/parse.rs` | `fn build_filter_suffix` | VERIFIED | Present at line 267; substantive implementation; called from `rewrite_ddl` SHOW arm at line 490 |
| `src/parse.rs` | `struct ShowClauses` | VERIFIED | Present at line 293; contains all 5 fields (like_pattern, in_view, for_metric, starts_with, limit) |
| `src/parse.rs` | `fn parse_show_filter_clauses` | VERIFIED | Present at line 304; substantive clause-ordered parser; called in `rewrite_ddl` SHOW arm |
| `src/parse.rs` | `mod phase34_1_1_show_filter_tests` | VERIFIED | Present at line 1902; 22 unit tests covering all combinations |
| `src/parse.rs` | No `fn rewrite_show_dims_for_metric` (absorbed) | VERIFIED | Confirmed absent — search returns no match |
| `test/sql/phase34_1_1_show_filtering.test` | Integration tests | VERIFIED | 18 test sections; 8,056 bytes; registered in TEST_LIST |
| `test/sql/TEST_LIST` | New test file registered | VERIFIED | `phase34_1_1_show_filtering.test` present in TEST_LIST |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `rewrite_ddl` SHOW arm | `extract_quoted_string` + `build_filter_suffix` | `parse_show_filter_clauses` at line 461, `build_filter_suffix` at line 490 | WIRED | `parse_show_filter_clauses` is called with `after_prefix` and `kind`; result's fields passed to `build_filter_suffix`; output appended to base SELECT |
| `rewrite_show_dims_for_metric` (FOR METRIC path) | `extract_quoted_string` + `build_filter_suffix` | Unified inside `parse_show_filter_clauses` + `rewrite_ddl` FOR METRIC branch | WIRED | FOR METRIC path uses same `clauses` struct; `build_filter_suffix` called once for all paths; sqllogictest Tests 13-15 verify end-to-end |
| `extract_ddl_name` SHOW arm | LIKE-skip + IN extraction | Lines 570-598: LIKE clause consumed before IN lookup | WIRED | `extract_ddl_name` at line 571 checks for LIKE prefix, calls `extract_quoted_string` to advance, then finds IN; unit tests `test_extract_ddl_name_like_before_in` and `test_extract_ddl_name_like_cross_view` verify |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| DDL-08 | 34.1.1-01-PLAN.md | SHOW SEMANTIC DIMENSIONS LIKE with case-insensitive matching | SATISFIED | `build_filter_suffix` uses `name ILIKE`; sqllogictest Tests 1-3, 17 verify ILIKE semantics (Test 3 uppercase pattern, lowercase match) |
| DDL-09 | 34.1.1-01-PLAN.md | SHOW SEMANTIC METRICS LIKE | SATISFIED | Same parser path; sqllogictest Test 7 verifies |
| DDL-10 | 34.1.1-01-PLAN.md | SHOW SEMANTIC FACTS LIKE | SATISFIED | Same parser path; sqllogictest Test 9 verifies |
| DDL-11 | 34.1.1-01-PLAN.md | SHOW SEMANTIC DIMENSIONS STARTS WITH (case-sensitive prefix) | SATISFIED | `build_filter_suffix` uses `name LIKE '{prefix}%'` (not ILIKE); sqllogictest Tests 4-5 verify case sensitivity (Test 5: uppercase 'C' returns 0 rows) |
| DDL-12 | 34.1.1-01-PLAN.md | SHOW SEMANTIC METRICS STARTS WITH | SATISFIED | Same parser path; sqllogictest Test 8 verifies |
| DDL-13 | 34.1.1-01-PLAN.md | SHOW SEMANTIC FACTS STARTS WITH | SATISFIED | Same parser path; sqllogictest Test 10 verifies |
| DDL-14 | 34.1.1-01-PLAN.md | SHOW SEMANTIC DIMENSIONS LIMIT | SATISFIED | `parse_show_filter_clauses` parses LIMIT as u64; `build_filter_suffix` appends; sqllogictest Test 6 verifies |
| DDL-15 | 34.1.1-01-PLAN.md | SHOW SEMANTIC METRICS LIMIT | SATISFIED | Same parser path; unit test `test_rewrite_show_metrics_starts_with_limit` verifies |
| DDL-16 | 34.1.1-01-PLAN.md | SHOW SEMANTIC FACTS LIMIT | SATISFIED | Same parser path; sqllogictest Test 11 verifies |
| DDL-17 | 34.1.1-01-PLAN.md | FOR METRIC variant supports LIKE, STARTS WITH, LIMIT | SATISFIED | sqllogictest Tests 13-15 verify LIKE, STARTS WITH, and LIMIT on FOR METRIC path end-to-end |
| DDL-18 | 34.1.1-01-PLAN.md | All clauses compose in single statement | SATISFIED | sqllogictest Test 12 uses LIKE + IN + STARTS WITH + LIMIT together; unit test `test_rewrite_show_dims_like_in_starts_with_limit` verifies SQL output |
| DDL-19 | 34.1.1-01-PLAN.md | Clauses work with both IN and cross-view forms | SATISFIED | sqllogictest Tests 1-5, 7-10 cover cross-view; Tests 3, 6, 11-15 cover IN (single-view) |

All 12 requirements satisfied. No orphaned requirements detected — REQUIREMENTS.md maps DDL-08 through DDL-19 exclusively to Phase 34.1.1.

### Anti-Patterns Found

None. Scanned `src/parse.rs` and `test/sql/phase34_1_1_show_filtering.test` for TODO/FIXME/placeholder/return null patterns — none found. All implementations are substantive with real logic, not stubs.

### Human Verification Required

None required. All behaviors are verifiable programmatically:
- SQL rewrite correctness: verified via unit tests with exact string assertions
- End-to-end filtering: verified via sqllogictest with exact row assertions
- Case-insensitive LIKE vs case-sensitive STARTS WITH: verified via Test 3 (LIKE '%NAME%' matches) and Test 5 (STARTS WITH 'Customer' returns 0 rows)
- Error on wrong clause order: verified via Test 16 (statement error)
- SQL injection safety: verified via unit test with O'Brien pattern

### Test Suite Results

| Suite | Result | Count |
|-------|--------|-------|
| Rust unit tests (`cargo test`) | PASSED | 476 tests (386 + 6 + 36 + 42 + 5 + 1) |
| Phase 34.1.1 unit tests | PASSED | 22 tests in `mod phase34_1_1_show_filter_tests` |
| sqllogictest (`just test-sql`) | PASSED | 17 files, 0 failed |
| Full quality gate (`just test-all`) | PASSED | All suites pass |

### Commits Verified

| Commit | Description | Exists |
|--------|-------------|--------|
| `ecfc415` | test(34.1.1-01): TDD RED — failing tests | YES |
| `de1728e` | feat(34.1.1-01): TDD GREEN — implementation | YES |
| `f6cb3c9` | test(34.1.1-01): sqllogictest integration | YES |

### Gaps Summary

No gaps. All 8 observable truths are verified, all 12 requirements are satisfied, all artifacts are substantive and wired, the full test suite passes including sqllogictest end-to-end tests.

---

_Verified: 2026-03-22T18:30:00Z_
_Verifier: Claude (gsd-verifier)_
