feat: implement UNIQUE dynamic array function (HF-68)#1708
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Task linked: HF-28 Modern dynamic array functions |
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Add UNIQUE(array, [by_col], [exactly_once]) as a dynamic array function, mirroring the FILTER machinery for data-dependent result size. Deduplication preserves first-occurrence order and reuses ArithmeticHelper for equality (case-insensitive by default, honoring the caseSensitive config). Supports by_col (unique columns) and exactly_once (values occurring exactly once). Errors in the input range propagate; an empty exactly_once result yields #N/A. Includes i18n for all 17 language packs, docs (built-in-functions, known-limitations), a changelog entry, and the shared ADR. Source: https://app.clickup.com/t/86c89q1tq ADR: docs/adr/2026-07-13-sort-unique-array-functions.md Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Additional details and impacted files@@ Coverage Diff @@
## develop #1708 +/- ##
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- Coverage 97.17% 96.88% -0.30%
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Files 176 177 +1
Lines 15483 15550 +67
Branches 3429 3446 +17
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+ Hits 15045 15065 +20
- Misses 438 485 +47
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What & why
Implements UNIQUE (
HF-68, child of HF-28 "Modern dynamic array functions", sibling of the shipped SEQUENCE and of VSTACK/HSTACK). AddsUNIQUE(array, [by_col], [exactly_once])as a dynamic array function.Tests: handsontable/hyperformula-tests#25 (paired).
Sibling PR: #1707 (SORT / HF-69).
ADR:
docs/adr/2026-07-13-sort-unique-array-functions.md.Behavior
by_colisTRUE) of the input, preserving first-occurrence order.by_col:FALSE(default) compares rows;TRUEcompares columns.exactly_once:TRUEreturns only rows/columns occurring exactly once;FALSE(default) returns all distinct.ArithmeticHelper.eq→ case-insensitive by default (honorscaseSensitive), matching Excel's UNIQUE.Design
Mirrors the FILTER machinery for dynamic-size results:
sizeOfResultArrayMethod+vectorizationForbidden: true, runtime viarunFunction, parse-time size method returning a freshArraySize(drops the input'sisRefflag). Deduplication is O(n²) in the number of vectors because locale-aware equality is not trivially hashable — noted in code; acceptable for v1.Notes — divergences from Excel (surfaced here + inline + in tests)
exactly_oncewhen nothing occurs exactly once) →#N/A. Excel returns#CALC!, which HyperFormula has no type for; mirrors FILTER's empty-result mapping (ADRdec_8).con_1).dec_7).Definition of Done
UniquePlugin.ts, registered viaplugin/index.ts)built-in-functions.md,known-limitations.mdSource: https://app.clickup.com/t/86c89q1tq
Note
Medium Risk
New array function affects formula evaluation and spill behavior; empty-result and equality semantics intentionally differ slightly from Excel (#N/A vs #CALC!, config-driven collation).
Overview
Adds Excel-style
UNIQUE(array, [by_col], [exactly_once])as a built-in dynamic array function, returning distinct rows or columns while preserving first-occurrence order.UniquePluginimplements row/column dedup viaArithmeticHelper.eq, optionalexactly_oncefiltering, first in-range error propagation, and#N/A(EmptyRange) whenexactly_onceyields no rows—aligned with FILTER’s empty-result behavior rather than Excel’s#CALC!. Parse-timeuniqueArraySizeuses the input dimensions as an upper bound (same dynamic-size pattern as FILTER).Wiring includes export from
plugin/index.ts,UNIQUEentries in all 17 language packs, changelog, built-in functions table, known-limitations notes, and a shared ADR documenting UNIQUE/SORT design (this PR is UNIQUE-only).Reviewed by Cursor Bugbot for commit 9eb508d. Bugbot is set up for automated code reviews on this repo. Configure here.