---
phase: 28-integration-testing-documentation
plan: 03
subsystem: testing, documentation
tags: [sqllogictest, e2e, readme, pk-fk, integration-test]

# Dependency graph
requires:
  - phase: 28-integration-testing-documentation
    plan: 01
    provides: "Function DDL removed -- only native DDL path remains"
provides:
  - "3-table E2E integration test with exact result verification (phase28_e2e.test)"
  - "Clean-slate README with AS-body PK/FK syntax documentation"
  - "DOC-01 requirement satisfied"
affects: []

# Tech tracking
tech-stack:
  added: []
  patterns: ["E2E test pattern: known data + hand-computed expected results + exact row verification"]

key-files:
  created:
    - test/sql/phase28_e2e.test
  modified:
    - test/sql/TEST_LIST
    - README.md

key-decisions:
  - "DESCRIBE expected output uses actual serialization format (table/from_alias/fk_columns/from_cols/join_columns) not the logical model fields"
  - "README: explain_semantic_view folded into multi-table section rather than separate section"
  - "WHERE composition test uses customer_name filter (not region filter) to avoid overlap with single-table test"

patterns-established:
  - "E2E test naming: phase28_e2e.test for comprehensive end-to-end scenario tests"
  - "E2E test structure: Setup -> Define -> Query tests with exact results -> Explain -> DESCRIBE -> Error cases -> Cleanup"

requirements-completed: ["DOC-01"]

# Metrics
duration: 20min
completed: 2026-03-13
---

# Phase 28 Plan 03: E2E Integration Test + README Rewrite Summary

**3-table PK/FK E2E integration test with 10 exact-result scenarios plus clean-slate README with AS-body syntax documentation**

## Performance

- **Duration:** 20 min
- **Started:** 2026-03-13T18:26:48Z
- **Completed:** 2026-03-13T18:46:48Z
- **Tasks:** 2
- **Files modified:** 3 (test/sql/phase28_e2e.test created, test/sql/TEST_LIST modified, README.md rewritten)

## Accomplishments
- Created phase28_e2e.test with 10 test scenarios covering the full DDL-to-query pipeline: cross-table joins, transitive 3-table joins, single-table queries, metrics-only, dims-only, explain verification, WHERE composition, DESCRIBE metadata, and error cases
- All results verified against hand-computed expected values from known inserted data (5 orders, 3 customers, 2 products)
- Rewrote README.md from scratch with AS-body PK/FK syntax only -- no references to removed function DDL
- README includes e-commerce domain examples, explain_semantic_view, all 7 DDL verbs, version v0.5.2

## Task Commits

Each task was committed atomically:

1. **Task 1: Create 3-table E2E integration test** - `34801df` (feat) + `09bb15a` (chore: TEST_LIST fix after parallel 28-02 merge)
2. **Task 2: Rewrite README.md** - `4daab29` (docs)

## Files Created/Modified
- `test/sql/phase28_e2e.test` - 3-table PK/FK E2E integration test with 10 scenarios and exact result verification
- `test/sql/TEST_LIST` - Added phase28_e2e.test; removed deleted phase2_ddl.test and semantic_views.test (parallel with 28-02)
- `README.md` - Clean-slate rewrite: How it works, Quick start (single table), Multi-table (PK/FK), DDL reference, Building

## Decisions Made
- DESCRIBE SEMANTIC VIEW expected output uses the actual JSON serialization format from the model (with `table`, `from_alias`, `fk_columns`, `from_cols`, `join_columns` fields) rather than the logical model names (`from_table`, `to_table`). Discovered during test verification -- the serialization uses serde field names which differ from the conceptual model.
- WHERE composition test (Test 8) uses `customer_name != 'Bob'` filter rather than region filter to demonstrate cross-table WHERE on a joined dimension, avoiding overlap with Test 4 (region-only).
- explain_semantic_view folded into multi-table section in README rather than a separate section, keeping the README concise.

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Fixed DESCRIBE expected output format**
- **Found during:** Task 1 (E2E test creation)
- **Issue:** Plan assumed DESCRIBE join output would use `from_table`/`to_table`/`join_columns` fields, but actual serialization uses `table`/`from_alias`/`fk_columns`/`from_cols` fields
- **Fix:** Updated expected DESCRIBE output to match actual serde serialization format
- **Files modified:** test/sql/phase28_e2e.test
- **Verification:** just test-sql passes with corrected output
- **Committed in:** 34801df (part of Task 1 commit)

**2. [Rule 3 - Blocking] Re-added phase28_e2e.test to TEST_LIST after parallel plan overwrote it**
- **Found during:** Task 1 (after commit)
- **Issue:** Parallel plan 28-02 committed after Task 1, overwriting TEST_LIST without the new phase28_e2e.test entry
- **Fix:** Added phase28_e2e.test to TEST_LIST in a follow-up commit
- **Files modified:** test/sql/TEST_LIST
- **Verification:** just test-sql runs all 7 tests including phase28_e2e.test
- **Committed in:** 09bb15a

---

**Total deviations:** 2 auto-fixed (1 bug, 1 blocking)
**Impact on plan:** Both fixes necessary for test correctness. No scope creep.

## Issues Encountered
- Parallel execution with Plan 28-02: 28-02 committed to TEST_LIST after Task 1, removing the phase28_e2e.test entry. Resolved with a follow-up commit re-adding the entry.

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

## Next Phase Readiness
- Phase 28 is now complete (all 3 plans executed)
- Full test suite passes: 7 SQL logic tests, all Rust unit/prop tests, DuckLake CI
- README documents only the current AS-body PK/FK syntax
- DOC-01 requirement satisfied

---
*Phase: 28-integration-testing-documentation*
*Completed: 2026-03-13*
