---
phase: 40-show-command-alignment
verified: 2026-04-02T12:00:00Z
status: passed
score: 8/8 must-haves verified
re_verification: false
---

# Phase 40: SHOW Command Alignment Verification Report

**Phase Goal:** All SHOW SEMANTIC commands output Snowflake-aligned column schemas -- dropping `expr`, renaming `source_table` to `table_name`, and adding metadata columns
**Verified:** 2026-04-02
**Status:** PASSED
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                                      | Status     | Evidence                                                                                  |
|----|------------------------------------------------------------------------------------------------------------|------------|-------------------------------------------------------------------------------------------|
| 1  | `SHOW SEMANTIC VIEWS` returns 5 columns: created_on, name, kind, database_name, schema_name               | VERIFIED   | `list.rs` lines 55-68: 5 `add_result_column` calls in exact order; `func()` emits indices 0-4 |
| 2  | `SHOW SEMANTIC DIMENSIONS` returns 6 columns: database_name, schema_name, semantic_view_name, table_name, name, data_type | VERIFIED   | `show_dims.rs` `bind_output_columns()` lines 43-65: 6 columns declared; `emit_rows()` uses `flat_vector(0-5)` |
| 3  | `SHOW SEMANTIC METRICS` returns 6 columns: database_name, schema_name, semantic_view_name, table_name, name, data_type  | VERIFIED   | `show_metrics.rs` `bind_output_columns()` lines 43-65: identical 6-column schema to dims  |
| 4  | `SHOW SEMANTIC FACTS` returns 6 columns: database_name, schema_name, semantic_view_name, table_name, name, data_type    | VERIFIED   | `show_facts.rs` `bind_output_columns()` lines 43-65: identical 6-column schema; `collect_facts` maps `f.output_type` to `data_type` |
| 5  | `SHOW SEMANTIC DIMENSIONS FOR METRIC` returns 4 columns: table_name, name, data_type, required (BOOLEAN, constant FALSE) | VERIFIED   | `show_dims_for_metric.rs` lines 169-182: 4 `add_result_column` calls; `LogicalTypeId::Boolean` for required; `as_mut_slice::<bool>()` writes constant `false` |
| 6  | No SHOW command exposes an `expr` column; all use `table_name` (not `source_table`)                        | VERIFIED   | `grep -r add_result_column.*"expr"` returns no matches; `grep -r add_result_column.*"source_table"` returns no matches across all `src/ddl/show_*.rs` files |
| 7  | LIKE, STARTS WITH, and LIMIT filtering continues to work on all SHOW commands                              | VERIFIED   | `phase34_1_1_show_filtering.test` contains 25 filter tests (Tests 1-15, 17-25) with `query TTTTTT`, `query TTTT`, and `query TTTT` patterns; 18 sqllogictests pass green |
| 8  | `just test-all` passes including 18 sqllogictests                                                          | VERIFIED   | "482 tests run: 482 passed, 0 skipped" + "18 tests run, 0 failed" + DuckLake CI "ALL PASSED" |

**Score:** 8/8 truths verified

---

### Required Artifacts

| Artifact                                          | Expected                                               | Status     | Details                                                                                          |
|---------------------------------------------------|--------------------------------------------------------|------------|--------------------------------------------------------------------------------------------------|
| `src/ddl/list.rs`                                 | 5-column SHOW VIEWS VTab with "SEMANTIC_VIEW" kind     | VERIFIED   | `ListRow` struct with 5 fields; `"SEMANTIC_VIEW"` literal at line 91; `SemanticViewDefinition::from_json` call at line 78; no `serde_json::Value` |
| `src/ddl/show_dims.rs`                            | 6-column SHOW DIMS VTab with database_name             | VERIFIED   | `ShowDimRow` struct with 6 fields; `"database_name"` column declared; no `"expr"` or `"source_table"` column; `flat_vector(5)` used |
| `src/ddl/show_metrics.rs`                         | 6-column SHOW METRICS VTab with database_name          | VERIFIED   | `ShowMetricRow` struct with 6 fields; identical schema to dims; `flat_vector(5)` used |
| `src/ddl/show_facts.rs`                           | 6-column SHOW FACTS VTab with data_type from Fact.output_type | VERIFIED   | `ShowFactRow` struct with 6 fields; `f.output_type.clone().unwrap_or_default()` for `data_type` at line 82 |
| `src/ddl/show_dims_for_metric.rs`                 | 4-column SHOW DIMS FOR METRIC with BOOLEAN required    | VERIFIED   | `ShowDimForMetricRow` struct with 3 fields (required emitted separately); `LogicalTypeId::Boolean` at line 180; `as_mut_slice::<bool>()` at line 326; exactly 4 `add_result_column` calls; fan-trap logic unchanged |
| `test/sql/phase34_1_show_commands.test`           | Updated sqllogictest expectations for 6-column schemas  | VERIFIED   | All DIMS/METRICS/FACTS queries use `query TTTTTT`; expected rows have `memory  main` prefix; no 5-T patterns |
| `test/sql/phase34_1_show_dims_for_metric.test`    | Updated sqllogictest for 4-column DIMS FOR METRIC schema | VERIFIED   | All `query TTTT` (not TTTTT); expected rows format: `{table}  {name}  (empty)  false`; no `query TTTTT` found |
| `test/sql/phase34_1_1_show_filtering.test`        | Updated sqllogictest for all SHOW filtering with new schemas | VERIFIED   | DIMS/METRICS/FACTS use `query TTTTTT`; FOR METRIC uses `query TTTT`; SHOW VIEWS tests use `SELECT ... FROM list_semantic_views()` with `query TTTT`; `SEMANTIC_VIEW` present in expected output |

### Key Link Verification

| From                          | To                                     | Via                                          | Status  | Details                                                                              |
|-------------------------------|----------------------------------------|----------------------------------------------|---------|--------------------------------------------------------------------------------------|
| `src/ddl/list.rs`             | `crate::model::SemanticViewDefinition` | `SemanticViewDefinition::from_json()`        | WIRED   | Import at line 9; call at line 78 inside `bind()`                                   |
| `src/ddl/show_facts.rs`       | `crate::model::Fact`                   | `f.output_type.clone().unwrap_or_default()`  | WIRED   | `def.facts.iter().map(|f| ...)` at line 76; `output_type` accessed at line 82       |
| `src/ddl/show_dims_for_metric.rs` | `duckdb::core::LogicalTypeId::Boolean` | `as_mut_slice::<bool>()` for required column | WIRED   | `LogicalTypeId::Boolean` at line 180; `as_mut_slice::<bool>()` at line 326; `let mut req_vec` at line 317 |
| `test/sql/phase34_1_1_show_filtering.test` | All 5 VTab files            | sqllogictest expected output                 | WIRED   | `query TTTTTT` appears 12 times for DIMS/METRICS/FACTS; `query TTTT` for FOR METRIC and VIEWS via `list_semantic_views()` |

### Data-Flow Trace (Level 4)

VTab functions collect data at bind time from the in-memory catalog, not at query time via fetch. Data-flow tracing applies differently:

| Artifact                 | Data Variable         | Source                                      | Produces Real Data | Status   |
|--------------------------|-----------------------|---------------------------------------------|---------------------|----------|
| `list.rs`                | `rows: Vec<ListRow>`  | `SemanticViewDefinition::from_json()` from catalog `guard.iter()` | Yes -- reads live catalog | FLOWING  |
| `show_dims.rs`           | `rows: Vec<ShowDimRow>` | `collect_dims()` from `guard.iter()`        | Yes -- reads live catalog | FLOWING  |
| `show_metrics.rs`        | `rows: Vec<ShowMetricRow>` | `collect_metrics()` from `guard.iter()`  | Yes -- reads live catalog | FLOWING  |
| `show_facts.rs`          | `rows: Vec<ShowFactRow>` | `collect_facts()` from `guard.iter()`      | Yes -- `output_type` from `Fact` struct | FLOWING  |
| `show_dims_for_metric.rs` | `rows: Vec<ShowDimForMetricRow>` | `def.dimensions.iter()` after fan-trap filter | Yes -- reads live catalog | FLOWING  |

### Behavioral Spot-Checks

Runnable checks require the extension binary (`just build`) and the sqllogictest runner. The `just test-all` run (18 sqllogictests, 482 Rust tests) serves as the comprehensive behavioral verification. All 18 sqllogictests pass, covering:

| Behavior                                            | Command              | Result                         | Status  |
|-----------------------------------------------------|----------------------|--------------------------------|---------|
| SHOW DIMS returns 6 columns with database_name      | `just test-sql`      | phase34_1_show_commands.test   | PASS    |
| SHOW METRICS returns 6 columns with database_name   | `just test-sql`      | phase34_1_show_commands.test   | PASS    |
| SHOW FACTS returns 6 columns with data_type         | `just test-sql`      | phase34_1_show_commands.test   | PASS    |
| SHOW DIMS FOR METRIC returns 4 cols with `false`    | `just test-sql`      | phase34_1_show_dims_for_metric.test | PASS |
| LIKE/STARTS WITH/LIMIT filtering on new schemas     | `just test-sql`      | phase34_1_1_show_filtering.test | PASS   |
| SHOW VIEWS via list_semantic_views() with SEMANTIC_VIEW | `just test-sql`  | phase34_1_1_show_filtering.test | PASS   |
| 482 Rust unit/proptest/doc tests                    | `cargo test`         | 482 passed, 0 failed           | PASS    |
| DuckLake CI integration                             | `just test-ducklake-ci` | ALL PASSED                  | PASS    |

### Requirements Coverage

| Requirement | Source Plan | Description                                                                    | Status    | Evidence                                                          |
|-------------|-------------|--------------------------------------------------------------------------------|-----------|-------------------------------------------------------------------|
| SHOW-01     | 40-01       | SHOW SEMANTIC VIEWS returns 5 columns: created_on, name, kind, database_name, schema_name | SATISFIED | `list.rs` 5-column schema; sqllogictest coverage via `list_semantic_views()` |
| SHOW-02     | 40-01       | SHOW SEMANTIC DIMENSIONS returns 6 columns                                     | SATISFIED | `show_dims.rs` 6-column schema; `phase34_1_show_commands.test` Tests 1, 2, 8 |
| SHOW-03     | 40-01       | SHOW SEMANTIC METRICS returns 6 columns                                        | SATISFIED | `show_metrics.rs` 6-column schema; `phase34_1_show_commands.test` Tests 3, 4 |
| SHOW-04     | 40-01       | SHOW SEMANTIC FACTS returns 6 columns                                          | SATISFIED | `show_facts.rs` 6-column schema; `phase34_1_show_commands.test` Tests 5, 6 |
| SHOW-05     | 40-02       | SHOW DIMS FOR METRIC returns 4 columns with BOOLEAN required (constant FALSE)  | SATISFIED | `show_dims_for_metric.rs` 4-column schema; `phase34_1_show_dims_for_metric.test` Tests 1-3, 6-7 |
| SHOW-06     | 40-01/40-02 | expr column removed from all SHOW commands                                     | SATISFIED | No `add_result_column.*"expr"` match in any `src/ddl/show_*.rs` file |
| SHOW-07     | 40-01/40-02 | source_table renamed to table_name in all SHOW commands                        | SATISFIED | No `add_result_column.*"source_table"` match in any `src/ddl/show_*.rs` file |
| SHOW-08     | 40-02       | LIKE, STARTS WITH, LIMIT filtering continues to work on all SHOW commands      | SATISFIED | `phase34_1_1_show_filtering.test` 25+ filter tests pass; `phase34_1_show_dims_for_metric.test` Tests 4-5 (error cases) pass |

All 8 requirements marked `[x]` complete in `.planning/REQUIREMENTS.md` with traceability to Phase 40.

### Anti-Patterns Found

None detected. Scanned all 5 modified VTab files (`list.rs`, `show_dims.rs`, `show_metrics.rs`, `show_facts.rs`, `show_dims_for_metric.rs`) and 6 test files for TODO/FIXME, empty returns, hardcoded stubs, and old column names. All clear.

### Human Verification Required

None. All observable behaviors are covered by the 18 sqllogictest files running via `just test-all`. The BOOLEAN `required` column rendering as `false` text (not `0`) was discovered and corrected during execution and is verified by the test suite.

### Notable Execution Deviations (Auto-Fixed)

Three deviations from the plan were discovered and fixed during plan 02 execution:

1. BOOLEAN renders as `'false'` text in DuckDB sqllogictest (not `'0'` integer). Query type changed from `TTTI` to `TTTT` with expected value `false` not `0`. Verified by passing tests.

2. `SELECT ... FROM (SHOW SEMANTIC VIEWS ...)` syntax unsupported by DuckDB parser. Tests use `SELECT ... FROM list_semantic_views() WHERE ...` instead. Verified by passing tests.

3. Three additional test files (`phase20_extended_ddl.test`, `phase25_keyword_body.test`, `phase34_1_alter_rename.test`) referenced the old 2-column SHOW VIEWS schema and needed updating to use `list_semantic_views()`. All updated in commit `e7489de`. Verified by all 18 sqllogictests passing.

### Gaps Summary

No gaps. All 8 success criteria are fully satisfied in the codebase. The full quality gate (`just test-all`: 482 Rust tests + 18 sqllogictests + DuckLake CI) passes completely.

---

_Verified: 2026-04-02_
_Verifier: Claude (gsd-verifier)_
