DEV-1854: consecutive_periods accepts null-test predicates - #363
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ZmeiGorynych merged 4 commits intoSep 3, 2026
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Add 'is' / 'is not' to _PREDICATE_COMPARISON_OPS so null tests classify as boolean-shaped in the consecutive_periods gate and emitter; drop the redundant COALESCE(<pred>, FALSE) wrapper (invalid T-SQL, every use site is a CASE WHEN condition). Golden baselines (dev1846 + dev1750) re-blessed for the wrapper removal; SQL Server strict xfail removed — the bare-boolean-projection path it described is gone, CI's integration-sqlserver workflow verifies.
…ects-null-test-predicates
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📝 WalkthroughWalkthrough
ChangesConsecutive-period null predicates
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change enables null-test predicates in consecutive-period formulas and adds stated validation coverage. No unresolved merge-blocking risk is identified. Sequence Diagram(s)sequenceDiagram
participant Formula
participant SQLGenerator
participant Database
Formula->>SQLGenerator: Build consecutive_periods with null predicate
SQLGenerator->>SQLGenerator: Validate predicate shape
SQLGenerator->>Database: Execute CASE expressions with direct predicate
Database-->>Formula: Return consecutive streak results
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 78.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 3 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In
`@openspec/changes/dev-1854-consecutive-periods-rejects-null-test-predicates/proposal.md`:
- Around line 54-56: Update the impact list in the proposal to reference the
actual golden artifact, tests/golden/dev1750_sql_baseline.json, replacing the
incorrect dev1846 path; preserve the associated tests/test_dev1846_golden_sql.py
entry if it remains affected.
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docs/concepts/formulas.mdopenspec/changes/dev-1854-consecutive-periods-rejects-null-test-predicates/.openspec.yamlopenspec/changes/dev-1854-consecutive-periods-rejects-null-test-predicates/design.mdopenspec/changes/dev-1854-consecutive-periods-rejects-null-test-predicates/proposal.mdopenspec/changes/dev-1854-consecutive-periods-rejects-null-test-predicates/specs/queries/transforms/spec.mdopenspec/changes/dev-1854-consecutive-periods-rejects-null-test-predicates/tasks.mdslayer/sql/generator.pytests/golden/dev1750_sql_baseline.jsontests/golden/dev1846_sql_baseline.jsontests/integration/test_integration_sqlserver.pytests/test_dev1846_golden_sql.pytests/test_dev1854_null_test_predicates.py
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Fixes DEV-1854.
What
"is"/"is not"to_PREDICATE_COMPARISON_OPSinslayer/sql/generator.py, so null tests (is None/is not None) classify as boolean-shaped in theconsecutive_periodsvalidation gate and emitter. Pre-fix, a compound predicate containing a null test was wrongly rejected ("'and' / 'or' / 'not' require boolean-shaped operands"), and a bare top-level null test rendered through the value path, wrapping a boolean in... IS NOT NULL AND ... <> 0— invalid on strictly-typed dialects.COALESCE(<predicate>, FALSE)wrapper in_emit_consecutive_periods_ctes_for_planned: every use site is aCASE WHENcondition, where NULL already acts as false, and the scalar wrapper is invalid T-SQL. The predicate is now theCASE WHENcondition directly._is_boolean_shaped's docstring with the null-test shape; add null tests andBETWEENto the accepted-shapes sentence indocs/concepts/formulas.md.Tests
tests/test_dev1854_null_test_predicates.py: SQLite + DuckDB execution tests for top-levelis not None/is Noneby store, a null test underand, a null test over a dimension column, plus a negative anchor ((hi_rev:sum is None) + 1→ ValueError naming the value-position shape).cp/is_null_top,cp/is_not_null_and) across five dialects intests/test_dev1846_golden_sql.py.ALLOWED_DELTASloop in bothdev1846_sql_baseline.json(7 cases × 5 dialects) anddev1750_sql_baseline.json(2 cases × 5 dialects); manifests emptied again.test_consecutive_periods_with_boolean_predicate(SQL Server integration): the bare-boolean-projection path it described no longer exists post-DEV-1846, and the re-blessed T-SQL golden shows predicates only inCASE WHENconditions — keeping the strict marker would XPASS-fail. Theintegration-sqlserverworkflow verifies the pass on this PR; the marker comes back only if it fails there.Full non-integration suite: 15426 passed, 0 failed. Ruff clean.
Spec surface (
openspec show dev-1854-consecutive-periods-rejects-null-test-predicates --diff)queries/transforms — two modified requirements
MODIFIED: Composite-input consecutive_periods @@ -1,12 +1,15 @@ ### Requirement: Composite-input consecutive_periods `consecutive_periods` SHALL accept any Mode-B value-key input tree — arithmetic -of any operator, scalar calls, `BETWEEN`, `IN` / negated `IN`, boolean -connectives, and nested transforms in any position. A boolean-shaped input is -used as the predicate directly with NULL treated as false; a value-shaped input -is true where its value is non-NULL and non-zero. Streak semantics are -unchanged: false or NULL breaks the run and returns 0. +of any operator, scalar calls, `BETWEEN`, `IN` / negated `IN`, null tests +(`is None` / `is not None`), boolean connectives, and nested transforms in any +position. A boolean-shaped input is used as the predicate directly with NULL +treated as false; a value-shaped input is true where its value is non-NULL and +non-zero. Streak semantics are unchanged: false or NULL breaks the run and +returns 0. Emitted SQL SHALL use a boolean-shaped predicate only in condition +positions — never wrapped as a scalar value — so generation is valid on +strictly-typed dialects (Postgres, T-SQL, BigQuery). @@ -43,4 +46,32 @@ +#### Scenario: Top-level null test drives the streak + +- **WHEN** a query requests `consecutive_periods(hi_rev:sum is not None)` + grouped by store, where one store's aggregate is NULL in the last month +- **THEN** the streak counts consecutive non-NULL months and the NULL month + breaks the run (and the `is None` form counts the complementary months) + +#### Scenario: Null test under a boolean connective + +- **WHEN** a query requests + `consecutive_periods(hi_rev:sum is not None and cost:sum > 0)` +- **THEN** the query executes with both conjuncts applied, rather than failing + with a boolean-shaped-operands `ValueError` + +#### Scenario: Null test over a dimension column + +- **WHEN** a query requests `consecutive_periods(store is not None)` grouped by + store +- **THEN** the referenced column materialises and the streak executes correctly + +#### Scenario: Predicates emit as bare conditions on strict dialects + +- **WHEN** SQL is generated for any boolean-shaped `consecutive_periods` + predicate (a null test included) on Postgres, T-SQL, or BigQuery +- **THEN** the predicate appears directly as the `CASE WHEN` condition, with no + `COALESCE(..., FALSE)` scalar wrapper and no `... IS NOT NULL AND ... <> 0` + truthiness wrapper around a boolean MODIFIED: consecutive_periods predicate typing contract @@ -1,15 +1,16 @@ ### Requirement: consecutive_periods predicate typing contract -Boolean-shaped SHALL be defined recursively as: a comparison; `BETWEEN`; `IN`; -or `and` / `or` / `not` whose operands are themselves boolean-shaped. ... +Boolean-shaped SHALL be defined recursively as: a comparison; a null test +(`is None` / `is not None`); `BETWEEN`; `IN`; or `and` / `or` / `not` whose +operands are themselves boolean-shaped. ... @@ -38,4 +39,10 @@ +#### Scenario: Null test in a value position rejected + +- **WHEN** a query requests `consecutive_periods((hi_rev:sum is None) + 1)` +- **THEN** the query fails with a `ValueError` naming the boolean-in-numeric + shape, rather than rendering the null test as an arithmetic operand🤖 Generated with Claude Code
https://claude.ai/code/session_01CjpYAGSqwqPERzVRbpvZCL
Summary by CodeRabbit
New Features
consecutive_periodsnow supportsis None,is not None, andBETWEENpredicates.Bug Fixes
Documentation
BETWEENpredicates.