---
phase: 52-yaml-ddl-integration
plan: 01
subsystem: parser
tags: [yaml, ddl, dollar-quoting, parse, serde]

# Dependency graph
requires:
  - phase: 51-yaml-parser-core
    provides: from_yaml_with_size_cap() deserialization on SemanticViewDefinition
provides:
  - "FROM YAML dollar-quoted DDL syntax in CREATE SEMANTIC VIEW"
  - "extract_dollar_quoted() parser for $$...$$ and $tag$...$tag$ strings"
  - "rewrite_ddl_yaml_body() YAML-to-JSON function call rewriter"
  - "Case-insensitive FROM YAML detection in validate_create_body"
  - "COMMENT = '...' FROM YAML integration (DDL comment overrides YAML comment)"
  - "sqllogictest integration tests for YAML DDL pipeline"
affects: [yaml-ddl-features, future-yaml-enhancements]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Dollar-quote extraction for multi-line string literals in DDL"
    - "YAML body path parallel to AS keyword body path in validate_create_body"

key-files:
  created:
    - test/sql/phase52_yaml_ddl.test
  modified:
    - src/parse.rs
    - tests/parse_proptest.rs
    - test/sql/TEST_LIST

key-decisions:
  - "Dollar-quote extraction returns first-match closing delimiter (greedy shortest match)"
  - "DDL COMMENT overrides YAML comment field when both present"
  - "Empty base_table auto-populated from first table entry (matching SQL DDL path)"
  - "infer_cardinality called on YAML-deserialized definition (matching SQL DDL path)"

patterns-established:
  - "FROM YAML detection uses same eq_ignore_ascii_case + whitespace-delimited pattern as AS detection"
  - "rewrite_ddl_yaml_body mirrors rewrite_ddl_keyword_body structure: parse -> validate -> serialize -> SQL-escape -> function call"

requirements-completed: [YAML-01, YAML-06]

# Metrics
duration: 40min
completed: 2026-04-18
---

# Phase 52 Plan 01: YAML DDL Integration Summary

**Dollar-quoted FROM YAML syntax wired into DDL parser with full CREATE/REPLACE/IF NOT EXISTS support, cardinality inference, and 21 unit + 13 integration tests**

## Performance

- **Duration:** 40 min
- **Started:** 2026-04-18T18:56:38Z
- **Completed:** 2026-04-18T19:37:19Z
- **Tasks:** 2
- **Files modified:** 4

## Accomplishments
- `CREATE SEMANTIC VIEW name FROM YAML $$ ... $$` creates queryable semantic views via the same JSON function call path as SQL DDL
- All three CREATE variants supported: CREATE, CREATE OR REPLACE, CREATE IF NOT EXISTS
- Dollar-quoting supports both untagged (`$$...$$`) and tagged (`$yaml$...$yaml$`) forms
- COMMENT = '...' integrates with FROM YAML, with DDL comment taking precedence over YAML comment field
- 21 unit tests and 13 sqllogictest integration tests validate the full pipeline end-to-end

## Task Commits

Each task was committed atomically:

1. **Task 1: Add dollar-quote extraction, YAML rewrite, and FROM YAML detection to parse.rs** - `9b2cf1d` (feat)
2. **Task 2: Add sqllogictest integration tests and update TEST_LIST** - `c632bed` (test)

## Files Created/Modified
- `src/parse.rs` - Added extract_dollar_quoted(), rewrite_ddl_yaml_body(), FROM YAML detection in validate_create_body(), updated error messages, 21 unit tests
- `tests/parse_proptest.rs` - Updated error message assertion for paren-body rejection proptest
- `test/sql/phase52_yaml_ddl.test` - 13 sqllogictest integration tests covering all YAML DDL scenarios
- `test/sql/TEST_LIST` - Added phase52_yaml_ddl.test entry

## Decisions Made
- Dollar-quote extraction returns first-match closing delimiter (shortest content match), consistent with PostgreSQL behavior
- DDL COMMENT = '...' overrides YAML comment field when both present, giving inline DDL syntax precedence
- Empty base_table is auto-populated from the first table entry, matching the SQL DDL keyword body path behavior
- infer_cardinality is called on the YAML-deserialized definition to ensure cardinality resolution matches the SQL DDL path

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Updated existing tests for new error message format**
- **Found during:** Task 1
- **Issue:** Three existing unit tests and one proptest asserted on the old error message "Expected 'AS' keyword" which now reads "Expected 'AS' or 'FROM YAML'"
- **Fix:** Updated assertions in test_validate_and_rewrite_rejects_paren_body, test_parse_error_position_paren_body_rejected, old_paren_body_is_rejected (unit tests), and position_invariant_paren_body_rejected (proptest) to match new error message
- **Files modified:** src/parse.rs, tests/parse_proptest.rs
- **Verification:** All 740 Rust tests pass, all 31 sqllogictests pass
- **Committed in:** 9b2cf1d (Task 1 commit)

---

**Total deviations:** 1 auto-fixed (Rule 1 - bug fix)
**Impact on plan:** Necessary correction for changed error message. No scope creep.

## Issues Encountered
- Extension build required git submodule init and DuckDB amalgamation file copy (worktree isolation does not carry these artifacts from the main repo)

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- YAML DDL syntax is fully functional and testable
- Ready for additional YAML-specific features (e.g., YAML-specific validation, DESCRIBE/SHOW integration)
- All existing SQL DDL tests continue to pass alongside YAML DDL tests

## Self-Check: PASSED

- All 4 created/modified files exist on disk
- Commit 9b2cf1d (Task 1) verified in git log
- Commit c632bed (Task 2) verified in git log
- All acceptance criteria content verified in src/parse.rs
- 740 Rust tests pass, 31 sqllogictest files pass

---
*Phase: 52-yaml-ddl-integration*
*Completed: 2026-04-18*
