---
phase: 55-materialization-routing-engine
verified: 2026-04-19T00:00:00Z
status: passed
score: 5/5 must-haves verified
---

# Phase 55: Materialization Routing Engine Verification Report

**Phase Goal:** Queries are transparently routed to pre-existing aggregated tables when materializations cover the request
**Verified:** 2026-04-19
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                                  | Status     | Evidence                                                                                                                          |
|----|--------------------------------------------------------------------------------------------------------|------------|-----------------------------------------------------------------------------------------------------------------------------------|
| 1  | A query whose dimensions and metrics exactly match a materialization reads from the materialization table instead of expanding raw sources | ✓ VERIFIED | `try_route_materialization()` returns `Some(sql)` on exact HashSet equality; Section 1 of sqllogictest confirms East/West rows from `p55_region_agg` (111.11/222.22 sentinel values in Section 7 confirm source) |
| 2  | A query with no matching materialization falls back to raw table expansion with no error               | ✓ VERIFIED | `None` returned when no mat matches; Section 2 confirms 3-row GROUP BY result from raw expansion with no error |
| 3  | A query involving semi-additive metrics always falls back to raw expansion regardless of materialization coverage | ✓ VERIFIED | `if resolved_mets.iter().any(|m| !m.non_additive_by.is_empty()) { return None; }` guard at line 39; Section 5 confirms latest_amount=150.00/50.00 (not 999.99 sentinel from mat table) |
| 4  | A query involving window function metrics always falls back to raw expansion regardless of materialization coverage | ✓ VERIFIED | `if resolved_mets.iter().any(|m| m.is_window()) { return None; }` guard at line 44; Section 6 confirms running_total CTE output (not 999.99 sentinel from mat table) |
| 5  | A view with no materializations produces identical query behavior to before this phase                 | ✓ VERIFIED | `if def.materializations.is_empty() { return None; }` fast path at line 34 (MAT-05); Section 4 confirms `p55_no_mat` without MATERIALIZATIONS clause produces correct raw expansion results |

**Score:** 5/5 truths verified

### Required Artifacts

| Artifact                                               | Expected                                                                   | Status     | Details                                                                                                        |
|--------------------------------------------------------|----------------------------------------------------------------------------|------------|----------------------------------------------------------------------------------------------------------------|
| `src/expand/materialization.rs`                        | `try_route_materialization()` pure function and `build_materialized_sql()` helper | ✓ VERIFIED | Both functions present; 17 unit tests in `#[cfg(test)] mod tests`; 527 lines                                  |
| `src/expand/mod.rs`                                    | `mod materialization;` declaration                                         | ✓ VERIFIED | Line 4: `mod materialization;` present (alphabetical between `join_resolver` and `resolution`)                |
| `src/expand/sql_gen.rs`                                | Routing call site in `expand()` after step 3                               | ✓ VERIFIED | Lines 358-365: routing call inserted after name resolution (`?;` at line 356) and before `toposort_facts` at line 369 |
| `src/expand/test_helpers.rs`                           | `with_materialization()` builder method on `TestFixtureExt`                | ✓ VERIFIED | Trait declaration at line 152-158 and implementation at lines 321-335; `Materialization` in import at line 6 |
| `test/sql/phase55_materialization_routing.test`        | End-to-end sqllogictest integration tests for routing                      | ✓ VERIFIED | 9 sections (setup + 8 test sections) covering all 4 requirement areas; 395 lines                              |
| `test/sql/TEST_LIST`                                   | Test runner discovery entry                                                | ✓ VERIFIED | `test/sql/phase55_materialization_routing.test` is the last entry on line 34                                  |

### Key Link Verification

| From                          | To                              | Via                                                         | Status     | Details                                                                    |
|-------------------------------|---------------------------------|-------------------------------------------------------------|------------|----------------------------------------------------------------------------|
| `src/expand/sql_gen.rs`       | `src/expand/materialization.rs` | `super::materialization::try_route_materialization()` call  | ✓ WIRED    | Lines 361-362: exact call pattern confirmed in `expand()` function         |
| `src/expand/materialization.rs` | `src/expand/resolution.rs`    | `use super::resolution::{quote_ident, quote_table_ref};`    | ✓ WIRED    | Line 11; both functions used in `build_materialized_sql()` at lines 89, 110 |
| `src/expand/materialization.rs` | `src/model.rs`                | `use crate::model::{Dimension, Metric, SemanticViewDefinition};` | ✓ WIRED    | Line 9; all three types used in function signatures                        |

### Data-Flow Trace (Level 4)

| Artifact                                        | Data Variable     | Source                             | Produces Real Data | Status      |
|-------------------------------------------------|-------------------|------------------------------------|--------------------|-------------|
| `src/expand/materialization.rs` (routing logic) | `routed_sql`      | `mat.table` from stored definition | Yes — table name from `def.materializations`; query targets real user-created tables | ✓ FLOWING |
| `test/sql/phase55_materialization_routing.test` | Section 1 result  | `p55_region_agg` via routing       | Yes — pre-inserted rows ('East', 250.00, 2), ('West', 250.00, 2) | ✓ FLOWING |
| `test/sql/phase55_materialization_routing.test` | Section 5 exclusion | raw `p55_orders` via CTE          | Yes — `latest_amount` 150.00/50.00 from raw data, not 999.99 sentinel | ✓ FLOWING |
| `test/sql/phase55_materialization_routing.test` | Section 7 first-match | `p55_first_agg` sentinel values  | Yes — 111.11/222.22 confirms first-mat-wins, not 333.33/444.44 from second | ✓ FLOWING |

### Behavioral Spot-Checks

Skipped — cannot run extension binary without `just build` + DuckDB. Sqllogictest integration tests (`test/sql/phase55_materialization_routing.test`) cover all behavioral paths end-to-end through the full extension pipeline. Full test suite (`just test-all`) confirmed passing with 796 tests, 0 failures per prompt.

### Requirements Coverage

| Requirement | Source Plan | Description                                                                   | Status      | Evidence                                                                                                            |
|-------------|-------------|-------------------------------------------------------------------------------|-------------|---------------------------------------------------------------------------------------------------------------------|
| MAT-02      | 55-01-PLAN  | Engine routes to materialization when it exactly covers requested dims/metrics | ✓ SATISFIED | `try_route_materialization()` HashSet exact-match logic; sqllogictest Section 1 confirms routing to `p55_region_agg` |
| MAT-03      | 55-01-PLAN  | When no match, falls back to raw expansion with no error                      | ✓ SATISFIED | `None` return path; sqllogictest Section 2 confirms 3-row raw GROUP BY result                                       |
| MAT-04      | 55-01-PLAN  | Semi-additive and window metrics excluded from routing                        | ✓ SATISFIED | Two guard clauses at lines 39-45; Sections 5 and 6 verify non-routing via sentinel values (999.99 never returned)   |
| MAT-05      | 55-01-PLAN  | Transparent behavior without materializations                                 | ✓ SATISFIED | Empty-vec fast path at line 34; sqllogictest Section 4 confirms `p55_no_mat` works without MATERIALIZATIONS clause  |

No orphaned requirements: REQUIREMENTS.md maps only MAT-02, MAT-03, MAT-04, MAT-05 to Phase 55, matching the plan's `requirements` field exactly.

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| `src/expand/sql_gen.rs` | 3708 | "not yet implemented" comment | Info | Pre-existing comment in a test about fact expansion guard — unrelated to phase 55 code; not a stub |

No blockers or warnings found in phase 55 code.

### Human Verification Required

None. All observable behaviors are fully verifiable through code inspection and the sqllogictest integration tests that ran as part of `just test-all`.

### Gaps Summary

No gaps. All 5 observable truths are verified, all 6 required artifacts exist and are substantive, all 3 key links are wired, all 4 requirements are satisfied, and the test suite passes with 796 tests.

---

_Verified: 2026-04-19_
_Verifier: Claude (gsd-verifier)_
