DEV-1777: mechanical consolidations — step-CTE extraction, throwaway ScopeFrames, positional couplings - #310
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Move the root_scope_ids gate above the qualification branch in _process_column_node_sync so a column outside the root scope (subquery / CTE / set-op branch / Values) is left untouched -- neither qualified against the outer root nor inlined. Previously qualification fired unconditionally, rebinding a subquery's own columns to the outer model: "amount IN (SELECT amount FROM other_tbl)" became "orders.amount IN (SELECT orders.amount FROM other_tbl)", silently changing the predicate. Contract: a Mode-A subquery must be self-contained; correlation to the outer model is not supported and is already rejected by assert_scope_closed. Tests: new tests/test_dev1752_subquery_scope.py (scope-locality, correlation contract, join-discovery, execution differential + correlated rejection); direct-expander cases (differing alias, UNION, WITH) in test_column_expansion_sync.py; flipped the DEV-1752 strict-xfail in test_dev1745_mode_a_door.py.
- Duplication gate (new_duplicated_lines_density 10.9% > 3%): the DEV-1752 test pack copied the ScopeFrame model fixtures from test_dev1745_mode_a_door.py. Extract _regions/_customers/_orders/_scope/_sql_of into a shared tests/_mode_a_scope_fixtures.py and import it from both files. - python:S5778: hoist the SlayerQuery construction out of the pytest.raises block in the correlated-rejection test so only engine.execute can throw inside.
… time-col resolver Step-CTE (sub-item 1): one _emit_step_cte shell backs the four window / unmaterialised-POST step-CTE sites in _generate_from_planned_impl (F1) and _render_cross_model_transform_chain (F2), plus _unmaterialised_post_slots (detection loop) and _inner_select_from_final_cte (trailing block). Per-site 3-way (F1) / 2-way (F2) Kahn splits, the time_shift / consecutive_periods dispatches, and the RuntimeError / NotImplementedError guards stay at the call sites. The per-slot render is a callback invoked before each slot's alias-map update, so a later same-step slot still sees earlier slots' aliases — the ordering the byte-identity depends on. Throwaway frame + dead branch (sub-item 2): _resolve_explicit_time_col deleted and time_column=None inlined at its sole caller. Static proof it was dead: _explicit_time_arg_of returns non-None only for first/last; first/last compile to RankedAggregatePlan and render through _ranked_value_expr, never through _build_agg_render_spec_from_planned (the only live caller); a string-literal search found no reflective access. Its dead-branch pins are removed (TestResolveExplicitTimeColViaResolver, test_reroot_aggregate_key Section G, TestBuilderFirstLast); live first/last behaviour stays covered by the e2e tests, TestExplicitTimeArgOf, and TestBuilderColumnKey (filter_sql). One _throwaway_frame(model, relation, bundle) now backs the three surviving throwaway-frame sites (_resolve_agg_kwargs_for_key, _collect_routed_filters, _filter_render_context). Verification: emitted SQL is byte-identical — test_dev1747_golden_sql green with ALLOWED_DELTAS empty, extended with nested-window F1/F2 dependency-split cases, a windowed date_range case, and a step-CTE count/order vacuity guard. Block D (F2 unmaterialised-POST), unreachable via real queries, is unit-pinned in test_dev1777_emit_step_cte along with the shell and the render-before-mutate invariant. Full non-integration suite green (11847 passed).
Positional couplings (sub-item 3). partition_declared_measures plus a
PreboundQuery.grain_declared_measures accessor single-source the dim / time-dim /
aggregate prefix-slice arithmetic the planners inlined; stage_planner (three
sites) and cross_model_planner (_grain_declared_measures + the reroot loop) now
read through them. The stage_planner slices run on a local declared_measures
list that is rebuilt between sites, so the free function is called per-site
(same boundaries, current list) rather than the accessor.
stage_planner also captures the minted date-range fids in the mint loop and
reuses that set instead of re-deriving {f"f{i}" for i in range(n_date_range)}
for the windowed _src row-filter routing.
3(c) deferred: the public_projection[i] positional pairing (and its silent None
fallback) is left byte-identical; the cardinality / ambiguity concern it encodes
is out of scope here and owned by DEV-1688.
Verification: emitted SQL unchanged — golden suite and full non-integration
suite green (11847 passed). partition_declared_measures / grain_declared_measures
equivalence to the old slicing is unit-tested; the malformed-date_range no-op
keeps its live e2e pin and a windowed date_range golden case pins the routed
filter.
…rding - Duplication gate: the shared tests/_mode_a_scope_fixtures.py mirrors the orders/customers/regions fixture triple that ~20 legacy test files carry inline. Migrating all of them is out of scope, so exclude the shared source from CPD (sonar.cpd.exclusions) — same mechanism as the dialect-mirror tests. - Codex: the self-contained-subquery contract is enforced by assert_scope_closed only under SLAYER_VALIDATE_SCOPES (on in CI, off in production), not at runtime. Reword the test/docs/DECISIONS accordingly and set the flag explicitly in the correlated-rejection test rather than leaning on the conftest autouse default.
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📝 WalkthroughWalkthroughMode-A expansion now respects SQL scope boundaries. Planner code shares declared-measure partitioning and preserves date-filter IDs. SQL generation centralizes transform-chain CTE emission and relies on planner-resolved ranking time. Tests add scope, partitioning, CTE, and dialect coverage. ChangesSQL planning and rendering
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to The refactor may emit the wrong alias when multiple names share one transform, causing incorrect generated SQL for that case. This is a bounded correctness risk that is mergeable with explicit owner awareness and follow-up coverage. Sequence Diagram(s)sequenceDiagram
participant QueryPlan
participant SQLGenerator
participant StepCTE
participant ScopeValidation
QueryPlan->>SQLGenerator: provide ranked plan and transform chain
SQLGenerator->>StepCTE: emit ordered step CTEs with aliases and casts
StepCTE-->>SQLGenerator: return carried columns
SQLGenerator->>ScopeValidation: validate preserved nested and explicit references
ScopeValidation-->>SQLGenerator: accept local scope or raise ScopeLeakError
SQLGenerator-->>QueryPlan: return final SQL projection and filters
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sonar.cpd.exclusions did not clear the new-code duplication gate for the shared fixtures file. Drop that approach: delete tests/_mode_a_scope_fixtures.py, restore test_dev1745_mode_a_door.py's original inline fixtures (its diff is now just the DEV-1752 xfail flip), and import the orders/customers/regions ScopeFrame fixtures into test_dev1752_subquery_scope.py directly from the DEV-1745 door pack. No new duplicated code is introduced, so the gate has nothing to flag. Reverts the sonar-project.properties CPD exclusion.
Process-reviews fixes for PR #310 (SonarCloud): - new_duplicated_lines_density gate (6.0% vs 3%): the byte-identical F1/F2 transform-chain tails (leftover-POST slot materialisation, inner-select, WITH assembly, POST-phase filter wrap, projection, outer wrap) are now one _finalise_transform_chain helper that both call sites return. - python:S9073: split the composite `"orders.a" in sql and "orders.b" in sql` assertion in test_dev1777_emit_step_cte into two independent assertions. Emitted SQL unchanged (golden suite + full non-integration suite green, 11847 passed).
…o egor/dev-1752-mode-a-expansion-qualifies-subquery-columns-against-the # Conflicts: # DECISIONS.md
test_server_truncates_at_63_bytes called SlayerQueryEngine._get_client(ds,
("probe","probe")), which the DEV-1450 pipeline renamed to _client_for(ds) (the
identity tuple is gone). The raw-probe call raised AttributeError, failing CI on
the merge. Switch to _client_for; the rest of the test (raw SELECT with an
over-limit alias, asserting Postgres truncates the returned column name to 63
bytes) is unchanged.
…ns-against-the' into egor/dev-1777-mechanical-consolidations-step-cte-extraction-throwaway # Conflicts: # slayer/sql/generator.py
…qualifies-subquery-columns-against-the DEV-1752: gate Mode-A qualification on root scope (subquery columns stay local)
…dev-1777-mechanical-consolidations-step-cte-extraction-throwaway
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Inline comments:
In `@slayer/sql/generator.py`:
- Around line 1762-1806: Update _emit_step_cte to assign successive entries from
slot.public_aliases to repeated occurrences of the same TransformKey, cycling
through aliases instead of always using public_aliases[0]. Preserve
declared_name fallback when no public aliases exist, and add regression coverage
for two aliases attached to one transform key.
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📒 Files selected for processing (19)
DECISIONS.mddocs/concepts/references.mdslayer/engine/column_expansion.pyslayer/engine/cross_model_planner.pyslayer/engine/prebound.pyslayer/engine/stage_planner.pyslayer/sql/generator.pytests/golden/dev1747_sql_baseline.jsontests/integration/test_dev1756_identifier_length_pg.pytests/test_agg_render_spec.pytests/test_column_expansion_sync.pytests/test_dev1476_first_last_explicit_time.pytests/test_dev1745_mode_a_door.pytests/test_dev1747_golden_sql.pytests/test_dev1752_subquery_scope.pytests/test_dev1777_declared_measure_partition.pytests/test_dev1777_emit_step_cte.pytests/test_reroot_aggregate_key.pytests/test_sql_generator.py
💤 Files with no reviewable changes (3)
- tests/test_agg_render_spec.py
- tests/test_reroot_aggregate_key.py
- tests/test_dev1476_first_last_explicit_time.py
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ZmeiGorynych
merged commit Aug 18, 2026
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…310 DEV-1777 mechanical consolidations) into local Stage 5
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Lands the three deferred pure refactors from DEV-1749 (PR 6). Contract: no emitted-SQL changes — each consolidation is byte-identical, verified against the golden SQL suite (
test_dev1747_golden_sql,ALLOWED_DELTASempty) and the full non-integration suite (11847 passed).Two commits (generator.py carries sub-items 1 and 2; the planners carry 3).
1. Step-CTE emission extracted
One
_emit_step_cteshell now backs the four window / unmaterialised-POST step-CTE sites in_generate_from_planned_impl(F1) and_render_cross_model_transform_chain(F2), plus_unmaterialised_post_slots(detection loop) and_inner_select_from_final_cte(trailing block). Per-site 3-way (F1) / 2-way (F2) Kahn splits, the time_shift/consecutive_periods dispatches, and the error guards stay at the call sites. The per-slot render is a callback invoked before each slot's alias-map update, so a later same-step slot still sees earlier slots' aliases — the ordering byte-identity depends on.2. Throwaway ScopeFrame consolidated + dead time-col resolver removed
_resolve_explicit_time_coldeleted (time_column=Noneinlined at its sole caller). Static proof it was dead:_explicit_time_arg_ofreturns non-None only for first/last; first/last compile toRankedAggregatePlanand render through_ranked_value_expr, never through_build_agg_render_spec_from_planned(the only live caller); a string-literal search found no reflective access. Dead-branch pins removed (TestResolveExplicitTimeColViaResolver,test_reroot_aggregate_keySection G,TestBuilderFirstLast) — live first/last behaviour stays covered by the e2e tests,TestExplicitTimeArgOf, andTestBuilderColumnKey(filter_sql). One_throwaway_frame(model, relation, bundle)backs the three surviving throwaway-frame sites (_resolve_agg_kwargs_for_key,_collect_routed_filters,_filter_render_context).3. Positional couplings made structural
partition_declared_measures+PreboundQuery.grain_declared_measuressingle-source the dim / time-dim / aggregate prefix slicing (stage_planner ×3, cross_model_planner ×2).date_range_fidscaptured from the mint loop instead of re-derived.3(c) deferred — the
public_projection[i]positional pairing (and its silent-Nonefallback) is left byte-identical; the cardinality/ambiguity concern it encodes is DEV-1688's domain.Coverage / notes
_render_outer_composite. Its shell + detector are unit-pinned intest_dev1777_emit_step_cte, and F1's byte-identical block-C wiring is golden-pinned (chain/local_multi_step). Golden matrix extended with F1/F2 nested-window dependency-split cases, a windoweddate_rangecase, and astep<n>count/order vacuity guard.Summary by CodeRabbit
Bug Fixes
Improvements