---
phase: 43-metadata-foundation
plan: 02
subsystem: parser
tags: [body-parser, annotations, comment, synonyms, private, access-modifier, sqllogictest]

# Dependency graph
requires:
  - phase: 43-01
    provides: AccessModifier enum, comment/synonyms/access fields on all model structs
provides:
  - COMMENT annotation parsing on views and all entry types (tables, dimensions, metrics, facts)
  - WITH SYNONYMS annotation parsing on all entry types
  - PRIVATE/PUBLIC leading keyword parsing on metrics and facts
  - PRIVATE rejection on dimensions with clear error
  - View-level COMMENT extraction between view name and AS keyword
  - ExpandError::PrivateMetric and ExpandError::PrivateFact variants
  - PRIVATE access enforcement at query expansion time
  - Integration tests for full DDL -> parse -> persist -> query pipeline
affects: [44 introspection, 45 SHOW/DESCRIBE metadata columns]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "parse_trailing_annotations() for depth-aware keyword scanning in SQL expressions"
    - "parse_leading_access_modifier() with table alias disambiguation (dot-after check)"
    - "extract_view_comment() for COMMENT between view name and AS keyword"
    - "PRIVATE access check after find_metric in expand() -- blocks direct queries, allows derived inlining"

key-files:
  created:
    - test/sql/phase43_metadata.test
  modified:
    - src/body_parser.rs
    - src/parse.rs
    - src/expand/types.rs
    - src/expand/sql_gen.rs
    - test/sql/TEST_LIST

key-decisions:
  - "Trailing annotations (COMMENT/SYNONYMS) parsed via depth-aware forward scan -- only matches keywords at depth-0 with word boundaries, preventing false positives on SQL identifiers like comment_count"
  - "PRIVATE keyword disambiguated from table aliases by checking if next non-whitespace char is '.' (e.g. private_schema.metric is NOT treated as PRIVATE keyword)"
  - "PRIVATE access check placed after find_metric in expand() -- derived metrics bypass access check because inline_derived_metrics resolves expressions, not access modifiers"
  - "parse_qualified_entries extended with allow_access_modifier and clause_name parameters -- DIMENSIONS passes false to reject PRIVATE"

patterns-established:
  - "ParsedAnnotations struct pattern for collecting trailing metadata from DDL entries"
  - "Access modifier enforcement at expansion time, not parse time -- allows PRIVATE metrics to exist for derived metric composition"

requirements-completed: [META-01, META-02, META-03, META-04, META-05]

# Metrics
duration: 101min
completed: 2026-04-10
---

# Phase 43 Plan 02: DDL Annotation Parsing and PRIVATE Enforcement Summary

**COMMENT, SYNONYMS, and PRIVATE/PUBLIC annotation parsing on all DDL entry types with query-time PRIVATE enforcement and full sqllogictest integration**

## Performance

- **Duration:** 101 min
- **Started:** 2026-04-10T08:07:47Z
- **Completed:** 2026-04-10T09:49:12Z
- **Tasks:** 3
- **Files modified:** 6

## Accomplishments
- Implemented trailing annotation parsing (COMMENT, WITH SYNONYMS) for all DDL entry types (tables, dimensions, metrics, facts)
- Implemented leading keyword parsing (PRIVATE, PUBLIC) for metrics and facts with table alias disambiguation
- Added view-level COMMENT extraction between view name and AS keyword in parse.rs
- Added ExpandError::PrivateMetric and ExpandError::PrivateFact variants with PRIVATE enforcement at expansion time
- Derived metrics referencing PRIVATE base metrics still expand correctly (inline_derived_metrics bypasses access check)
- Created 12-case sqllogictest integration test covering full DDL -> parse -> persist -> query pipeline
- 22 new unit tests across body_parser.rs (14), parse.rs (4), sql_gen.rs (4)

## Task Commits

Each task was committed atomically:

1. **Task 1: Body parser trailing annotations (COMMENT, SYNONYMS) and leading keyword (PRIVATE/PUBLIC)** - `e9aaa9a` (test) + `8d166b9` (feat) -- TDD red+green
2. **Task 2: View-level COMMENT in parse.rs + PRIVATE enforcement in expansion engine** - `244a768` (feat)
3. **Task 3: Integration tests via sqllogictest** - `115c5db` (test)

## Files Created/Modified
- `src/body_parser.rs` - ParsedAnnotations, parse_trailing_annotations(), extract_single_quoted_string(), parse_synonym_list(), parse_leading_access_modifier(); updated parse_single_qualified_entry, parse_single_metric_entry, parse_single_table_entry, parse_keyword_body
- `src/parse.rs` - extract_view_comment(), updated validate_create_body and rewrite_ddl_keyword_body for view-level COMMENT
- `src/expand/types.rs` - ExpandError::PrivateMetric and ExpandError::PrivateFact variants with Display impl
- `src/expand/sql_gen.rs` - AccessModifier import, PRIVATE access check in expand(), 4 unit tests
- `test/sql/phase43_metadata.test` - 12 integration test cases
- `test/sql/TEST_LIST` - Added phase43_metadata.test

## Decisions Made
- Trailing annotations parsed via depth-aware forward scan at depth-0 with word boundary matching -- prevents false positives on SQL identifiers like `comment_count`
- PRIVATE keyword disambiguated from table aliases by checking if next non-whitespace is `.` -- `private_schema.metric` is NOT treated as PRIVATE
- parse_qualified_entries extended with allow_access_modifier/clause_name parameters rather than separate functions for FACTS vs DIMENSIONS
- PRIVATE access check placed after find_metric in expand() -- derived metrics bypass because inline_derived_metrics resolves expressions, not access modifiers

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Fixed derived metric DDL syntax in integration test**
- **Found during:** Task 3
- **Issue:** Integration test used `o.profit AS total_revenue - total_cost` (qualified syntax) for a derived metric, but derived metrics must be unqualified (`profit AS total_revenue - total_cost`)
- **Fix:** Removed `o.` prefix from derived metric in test file
- **Files modified:** test/sql/phase43_metadata.test
- **Committed in:** 115c5db

---

**Total deviations:** 1 auto-fixed (1 bug in test data)
**Impact on plan:** Trivial test syntax fix. No scope change.

## Issues Encountered
- Build infrastructure required git submodule init, configure directory setup, and DuckDB amalgamation symlinks for worktree. Resolved by copying/symlinking from main repo.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- All model fields (comment, synonyms, access) are now populated from DDL through the full pipeline
- Metadata persists through JSON serialization (serde fields from Plan 01)
- PRIVATE enforcement blocks direct queries, allows derived metric composition
- Ready for introspection phase to expose metadata in SHOW/DESCRIBE output

## Self-Check: PASSED

- All 6 modified/created files exist on disk
- Task commit e9aaa9a exists in git log (test RED)
- Task commit 8d166b9 exists in git log (feat GREEN)
- Task commit 244a768 exists in git log (feat parse+expand)
- Task commit 115c5db exists in git log (test integration)
- cargo test: 518 tests pass (0 failures)
- sqllogictest: 20 test files pass (0 failures)

---
*Phase: 43-metadata-foundation*
*Completed: 2026-04-10*
