feat(drive)!: sum axes on indexOnly indexes via ItemWithSumItem terminals - #4506
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…nals Lift the parser rejection of the sum axes (summable / rangeSummable / rankedSummable / rankedAverageable) on indexOnly indexes. A summable index's terminal entry becomes ItemWithSumItem(row commitment, amount) — the same commitment payload every plain entry carries, plus the summed property's value — so entries contribute to ancestor sum trees exactly as stored types' ReferenceWithSumItem references do, and the existing sum / ranked-sum query surfaces serve indexOnly types unchanged. - dpp: remove the indexOnly sum-axes rejection; the doctype-level summable cross-checks (canonical property, i64-safe integer type, required membership) and the indexOnly every-property-indexed rule already cover the new admission. - drive write path: the terminal member tree composes countability x summability through a new shared terminal_member_tree_type dispatch (also replacing the duplicated inline tables in the stored insert and delete branches); the summable insert branch writes ItemWithSumItem with the amount read off the document; estimation reserves the 10-byte worst-case sum item on both sides. Delete needs no sum logic: grovedb reads the amount off the stored element and propagates the subtraction, and a falsified amount dies on the commitment probe since the amount is a committed property. - probes/verify: the commitment probe and the executed-transition verifier accept the sum-bearing element; the verifier additionally checks the proved sum contribution against the created document when the proof index is summable. - fixture/tests: yappr tip doctype (byPost with full count+sum axes, byTipperAmount plain); e2e coverage for element shapes, sum totals (unproved + proved parity), ranked Sum ordering, delete subtraction and pruning, falsified-amount refusal, estimation upper bounds; abci executed-proof lifecycle on the summable type including the forged-amount refusal. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughIndex-only document types now accept summable indexes. Storage writes ChangesSummable index-only documents
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This change adds sum support for index-only document indexes with corresponding validation, proof, deletion, and test coverage. No actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Client
participant Drive
participant GroveDb
participant ProofVerifier
Client->>Drive: Insert index-only document
Drive->>Drive: Read sum contribution
Drive->>GroveDb: Store ItemWithSumItem
Client->>ProofVerifier: Verify executed proof
ProofVerifier->>Drive: Recompute sum contribution
ProofVerifier->>GroveDb: Validate commitment and sum value
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## v4.2-dev #4506 +/- ##
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+ Coverage 82.66% 83.18% +0.52%
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Files 2744 2773 +29
Lines 370075 374039 +3964
============================================
+ Hits 305916 311141 +5225
+ Misses 64159 62898 -1261
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In `@packages/rs-drive/src/drive/document/mod.rs`:
- Around line 191-197: Gate the Document import with the same server-or-verify
configuration as read_document_sum_contribution, so verify-only builds can
resolve its signature while preserving the existing server behavior.
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book/src/drive/index-only-document-types.mdpackages/rs-dpp/src/data_contract/document_type/class_methods/try_from_schema/common/mod.rspackages/rs-dpp/src/data_contract/document_type/class_methods/try_from_schema/v3/index_only_tests.rspackages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/document/index_only.rspackages/rs-drive/src/drive/contract/insert/insert_contract/v0/tests/index_only_e2e_tests.rspackages/rs-drive/src/drive/document/delete/remove_reference_for_index_level_for_contract_operations/v0/mod.rspackages/rs-drive/src/drive/document/index_level_tree_types.rspackages/rs-drive/src/drive/document/index_only.rspackages/rs-drive/src/drive/document/insert/add_reference_for_index_level_for_contract_operations/v0/mod.rspackages/rs-drive/src/drive/document/mod.rspackages/rs-drive/src/verify/state_transition/verify_state_transition_was_executed_with_proof/v0/mod.rspackages/rs-drive/tests/supporting_files/contract/yappr-likes/yappr-likes-contract.json
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read_document_sum_contribution is compiled for server || verify, but its Document parameter type was imported only under server — E0412 on verify-only builds (wasm SDK / Kotlin / JS pipelines). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Issue being fixed or feature implemented
indexOnly document types (the #4491–#4505 stack) supported only the count axes: an entry contributes 1 to its prefix groups. Value-weighted features — a
tipdoctype where each entry carries anamount, with per-post totals and a "top posts by total tipped" leaderboard — had no storage mode: the parser rejected every sum keyword on indexOnly indexes.What was done?
The unlock is an element grovedb already has:
Element::ItemWithSumItem(payload, sum, flags). A summable indexOnly index's terminal entry becomesItemWithSumItem(row commitment, amount)— the same 32-byte commitment payload every plain entry carries (all splice/ownership guarantees intact), plus the summed property's value — so entries contribute to ancestor sum trees exactly as stored types'ReferenceWithSumItemreferences do, and the existing sum / ranked-sum query surfaces serve indexOnly types with zero query-side changes (the pickers are index-shape-driven).requiredmembership) run for every doctype, and the indexOnly every-property-indexed rule forces the summed property into an index, keeping it recoverable and covered by the row commitment.0member tree now composes countability × summability through a sharedterminal_member_tree_typedispatch — one source of truth replacing the duplicated inline tables in the stored insert/delete branches and the count-only maps in the indexOnly branches. The summable insert branch writesItemWithSumItemwith the amount read off the document (read_document_sum_contribution, cfg widened toverify); estimation reserves the 10-byte worst-case sum item on both sides.tipdoctype (byPost[postId] → $ownerIdwith the full count+sum axis set;byTipperAmount[$ownerId, amount] → postIdwith none). E2e pins: element shapes per index, per-post totals via point-lookup sum (unproved + proved parity throughGroveDb::verify_query), ranked Sum-axis ordering, delete subtraction + drained-group pruning, falsified-amount refusal, estimated ≥ actual fees. ABCI: the full executed-proof lifecycle on the summable type, including a forged-amount transition refused on the sum contribution.How Has This Been Tested?
cargo test -p dpp --features validation index_only— 34 passed (rejection test rewritten into admission + cross-check coverage)cargo test -p drive --features server,verify,fixtures-and-mocks --lib index_only/sum— 26 / 168 passedcargo test -p drive-abci index_only— 9 passedcargo clippy -p dpp -p drive -p drive-abci --all-features --all-targets -- -D warningsclean;cargo check --workspace --all-featurescleanBreaking Changes
Consensus-breaking on the unreleased PV14 only: contracts declaring sum axes on indexOnly indexes were rejected and can now register; summable indexOnly indexes lay down sum-typed trees and sum-bearing elements. No released protocol version changes behavior.
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Summary by CodeRabbit
New Features
Bug Fixes
Tests