---
phase: 44-show-describe-metadata-surface-enhancements
verified: 2026-04-11T00:00:00Z
status: passed
score: 5/5 must-haves verified
re_verification: false
---

# Phase 44: SHOW/DESCRIBE Metadata Surface + Enhancements Verification Report

**Phase Goal:** Users can see metadata annotations in SHOW/DESCRIBE output and use new introspection modes (TERSE, IN SCHEMA/DATABASE, SHOW COLUMNS)
**Verified:** 2026-04-11
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | SHOW SEMANTIC VIEWS/DIMENSIONS/METRICS/FACTS output includes synonyms and comment columns populated from stored metadata | VERIFIED | `show_dims.rs`, `show_metrics.rs`, `show_facts.rs` all declare 8-column schema with `synonyms`+`comment`; `list.rs` declares 6-column schema with `comment`; `format_json_array` called on `d.synonyms`; test file `phase44_show_metadata.test` exercises all four SHOW commands with annotated data |
| 2 | SHOW SEMANTIC VIEWS IN SCHEMA schema_name returns only views in that schema; IN DATABASE db_name returns only views in that database | VERIFIED | `parse.rs` `parse_in_scope` function handles both `SCHEMA` and `DATABASE` keywords; `build_filter_suffix` generates `schema_name = '...'` and `database_name = '...'` WHERE predicates; `phase44_show_terse_scope.test` tests 13 and 14 verify IN SCHEMA/IN DATABASE DDL forms |
| 3 | SHOW TERSE SEMANTIC VIEWS returns a reduced column set (name and essential identifiers only) | VERIFIED | `ListTerseSemanticViewsVTab` in `list.rs` declares exactly 5 columns (created_on, name, kind, database_name, schema_name — no comment); parse.rs maps `ShowTerse` to `list_terse_semantic_views`; registered in `lib.rs`; tested in `phase44_show_terse_scope.test` |
| 4 | SHOW COLUMNS IN SEMANTIC VIEW returns a unified list of all dims, facts, and metrics with a kind column distinguishing them | VERIFIED | `show_columns.rs` `ShowColumnsInSemanticViewVTab` collects dimensions (kind=DIMENSION), public facts (kind=FACT), public metrics (kind=METRIC), derived metrics (kind=DERIVED_METRIC); PRIVATE items filtered by `fact.access == AccessModifier::Private`; 8 output columns; parse.rs maps `ShowColumns` to `show_columns_in_semantic_view`; `phase44_show_columns.test` exercises all kind values and PRIVATE exclusion |
| 5 | DESCRIBE SEMANTIC VIEW includes COMMENT, SYNONYMS, and ACCESS_MODIFIER properties in its property-per-row output | VERIFIED | `describe.rs` emits view-level COMMENT (empty object_kind/object_name), TABLE COMMENT+SYNONYMS after PRIMARY_KEY, DIMENSION COMMENT+SYNONYMS after DATA_TYPE, FACT/METRIC/DERIVED_METRIC COMMENT+SYNONYMS+ACCESS_MODIFIER; omits COMMENT/SYNONYMS when None/empty; ACCESS_MODIFIER always emitted for facts and metrics; `phase44_describe_metadata.test` covers 7 test cases |

**Score:** 5/5 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/ddl/list.rs` | 6-column SHOW SEMANTIC VIEWS (with comment) + 5-column ListTerseSemanticViewsVTab | VERIFIED | `comment: String` in `ListRow`; `comment_vec = output.flat_vector(5)`; `ListTerseSemanticViewsVTab` struct with 5 columns declared |
| `src/ddl/show_dims.rs` | 8-column output schema for SHOW SEMANTIC DIMENSIONS | VERIFIED | `synonyms: String, comment: String` in `ShowDimRow`; `format_json_array(&d.synonyms)` called; vectors 6 and 7 emitted; imports `format_json_array` from `super::describe` |
| `src/ddl/show_metrics.rs` | 8-column output schema for SHOW SEMANTIC METRICS | VERIFIED | Same pattern as show_dims.rs — `synonyms: String, comment: String` in `ShowMetricRow`; `format_json_array(&m.synonyms)`; vectors 6 and 7 |
| `src/ddl/show_facts.rs` | 8-column output schema for SHOW SEMANTIC FACTS | VERIFIED | Same pattern — `synonyms: String, comment: String` in `ShowFactRow`; `format_json_array(&f.synonyms)`; vectors 6 and 7 |
| `src/ddl/describe.rs` | COMMENT, SYNONYMS, ACCESS_MODIFIER property rows; pub(crate) format_json_array | VERIFIED | `pub(crate) fn format_json_array`; `use crate::model::AccessModifier`; all four collect_* functions emit COMMENT/SYNONYMS conditionally and ACCESS_MODIFIER always for facts/metrics; view-level COMMENT push with `object_kind: String::new()` |
| `src/parse.rs` | DdlKind::ShowTerse, DdlKind::ShowColumns, IN SCHEMA/DATABASE parsing | VERIFIED | `ShowTerse` and `ShowColumns` variants in enum; `match_keyword_prefix` calls for both; `parse_in_scope` helper; `build_filter_suffix` extended with `in_schema`/`in_database` params; `ShowClauses` has `in_schema`/`in_database` fields |
| `src/ddl/show_columns.rs` | ShowColumnsInSemanticViewVTab with 8-column output | VERIFIED | `pub struct ShowColumnsInSemanticViewVTab`; 8 output columns; `AccessModifier::Private` filtering; all four kind strings present; results sorted by kind then column_name |
| `src/ddl/mod.rs` | show_columns module declaration | VERIFIED | `pub mod show_columns;` present |
| `src/lib.rs` | Registration of ListTerseSemanticViewsVTab and ShowColumnsInSemanticViewVTab | VERIFIED | Both registered via `register_table_function_with_extra_info`; function names `"list_terse_semantic_views"` and `"show_columns_in_semantic_view"` match parse.rs mappings |
| `test/sql/phase44_show_metadata.test` | Integration tests for SHOW-01 metadata columns | VERIFIED | 6 test cases covering all four SHOW commands with annotated and plain views |
| `test/sql/phase44_describe_metadata.test` | Integration tests for SHOW-06 DESCRIBE metadata properties | VERIFIED | 7 test cases covering view-level COMMENT, TABLE/DIMENSION/FACT/METRIC/DERIVED_METRIC annotations, and plain view with no annotations |
| `test/sql/phase44_show_terse_scope.test` | Integration tests for TERSE and IN SCHEMA/DATABASE | VERIFIED | 16 test cases covering SHOW TERSE, IN SCHEMA, IN DATABASE, combined forms, and error cases |
| `test/sql/phase44_show_columns.test` | Integration tests for SHOW COLUMNS IN SEMANTIC VIEW | VERIFIED | 7 test cases covering all kind values, PRIVATE exclusion, comment column, error on nonexistent view |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `src/ddl/show_dims.rs` | `src/model.rs` | `d.synonyms`, `d.comment` fields on `Dimension` | WIRED | `format_json_array(&d.synonyms)` and `d.comment.clone().unwrap_or_default()` in `collect_dims` |
| `src/ddl/show_metrics.rs` | `src/model.rs` | `m.synonyms`, `m.comment` fields on `Metric` | WIRED | Same pattern in `collect_metrics` |
| `src/ddl/show_facts.rs` | `src/model.rs` | `f.synonyms`, `f.comment` fields on `Fact` | WIRED | Same pattern in `collect_facts` |
| `src/ddl/describe.rs` | `src/model.rs` | `AccessModifier` enum, comment/synonyms on all structs | WIRED | `use crate::model::AccessModifier`; all collect_* functions reference `dim.comment`, `dim.synonyms`, `fact.access`, `metric.access`, etc. |
| `src/parse.rs` | `src/ddl/show_columns.rs` | `DdlKind::ShowColumns` -> `"show_columns_in_semantic_view"` function name | WIRED | `function_name(DdlKind::ShowColumns) => "show_columns_in_semantic_view"`; VTab registered with same name in lib.rs |
| `src/parse.rs` | `src/ddl/list.rs` | `DdlKind::ShowTerse` -> `"list_terse_semantic_views"` function name | WIRED | `function_name(DdlKind::ShowTerse) => "list_terse_semantic_views"`; VTab registered with same name in lib.rs |
| `src/lib.rs` | `src/ddl/show_columns.rs` | `register_table_function_with_extra_info::<ShowColumnsInSemanticViewVTab>` | WIRED | Direct import and registration confirmed |

### Data-Flow Trace (Level 4)

| Artifact | Data Variable | Source | Produces Real Data | Status |
|----------|---------------|--------|--------------------|--------|
| `show_dims.rs` | `d.synonyms`, `d.comment` | `SemanticViewDefinition::from_json` -> `def.dimensions` | Yes — deserialized from stored catalog JSON with serde | FLOWING |
| `show_columns.rs` | `fact.access`, `metric.access` | `SemanticViewDefinition::from_json` -> `def.facts`, `def.metrics` | Yes — `AccessModifier` deserialized from JSON, defaults to `Public` | FLOWING |
| `describe.rs` | `def.comment`, `fact.access`, `metric.synonyms` | `SemanticViewDefinition::from_json` | Yes — all fields deserialized via serde with `#[serde(default)]` for backward compatibility | FLOWING |
| `list.rs` ListTerseSemanticViewsVTab | `created_on`, `database_name`, `schema_name` | `SemanticViewDefinition::from_json` from catalog | Yes — reads real stored catalog state via `CatalogState` RwLock | FLOWING |

### Behavioral Spot-Checks

| Behavior | Evidence | Status |
|----------|----------|--------|
| `DdlKind::ShowTerse` parsed from `SHOW TERSE SEMANTIC VIEWS` | `detect_ddl_prefix` -> `match_keyword_prefix(b, &[b"show", b"terse", b"semantic", b"views"])` at line 141; unit test `test_rewrite_show_terse` in parse.rs asserts rewrite produces `list_terse_semantic_views()` | PASS |
| `DdlKind::ShowColumns` parsed from `SHOW COLUMNS IN SEMANTIC VIEW` | `detect_ddl_prefix` -> `match_keyword_prefix(b, &[b"show", b"columns", b"in", b"semantic", b"view"])` at line 137; unit test `test_rewrite_show_columns_in_semantic_view` asserts rewrite | PASS |
| IN SCHEMA produces WHERE predicate | `build_filter_suffix` adds `schema_name = 'escaped'`; unit test `test_rewrite_show_terse_in_schema` asserts `WHERE schema_name = 'main'` | PASS |
| PRIVATE items excluded from SHOW COLUMNS | `collect_column_rows` in show_columns.rs: `if fact.access == AccessModifier::Private { continue; }` | PASS |
| 527 Rust tests pass | Confirmed in 44-02-SUMMARY.md self-check | PASS |
| 24 sqllogictest files pass | Confirmed in 44-02-SUMMARY.md self-check | PASS |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|-------------|-------------|--------|----------|
| SHOW-01 | 44-01 | SHOW SEMANTIC VIEWS/DIMENSIONS/METRICS/FACTS include synonyms and comment columns | SATISFIED | show_dims/metrics/facts.rs 8-column schema; list.rs 6-column schema; phase44_show_metadata.test |
| SHOW-02 | 44-02 | SHOW SEMANTIC VIEWS IN SCHEMA schema_name filters by schema | SATISFIED | parse_in_scope handles SCHEMA keyword; build_filter_suffix generates WHERE predicate; phase44_show_terse_scope.test |
| SHOW-03 | 44-02 | SHOW SEMANTIC VIEWS IN DATABASE db_name filters by database | SATISFIED | Same parse_in_scope handles DATABASE; build_filter_suffix generates WHERE predicate; phase44_show_terse_scope.test |
| SHOW-04 | 44-02 | SHOW TERSE SEMANTIC VIEWS returns reduced column set | SATISFIED | ListTerseSemanticViewsVTab 5-column output; phase44_show_terse_scope.test |
| SHOW-05 | 44-02 | SHOW COLUMNS IN SEMANTIC VIEW returns unified dims+facts+metrics with kind column | SATISFIED | ShowColumnsInSemanticViewVTab 8-column output with kind; phase44_show_columns.test |
| SHOW-06 | 44-01 | DESCRIBE SEMANTIC VIEW includes COMMENT, SYNONYMS, and ACCESS_MODIFIER properties | SATISFIED | describe.rs emits all three property types; phase44_describe_metadata.test |

No orphaned requirements: REQUIREMENTS.md maps only SHOW-01 through SHOW-06 to Phase 44. SHOW-07 and SHOW-08 are mapped to Phase 45.

### Anti-Patterns Found

None. No TODO/FIXME/placeholder comments or stub implementations found in any modified files.

### Human Verification Required

None. All success criteria are verifiable through code inspection and the confirmed-passing test suite (527 cargo tests, 24 sqllogictests).

### Gaps Summary

No gaps identified. All five roadmap success criteria are fully implemented, wired, and tested.

---

_Verified: 2026-04-11_
_Verifier: Claude (gsd-verifier)_
