fix: enforce 32-level attribute nesting depth on writes#123
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pdf-amzn merged 1 commit intoMay 29, 2026
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please rebase and resolve conflicts |
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Overall looks okay. Please rebase/merge and resolve conflicts, then we can merge.
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| The following unenforced limits are tracked in `docs/technical-debt.md`: | ||
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| 1. **Provisioned capacity decrease limit** (27/day) — would require per-table decrease counter with hourly replenishment | ||
| 2. **Attribute nesting depth** (32 levels) — requires recursive depth check in attribute value validation |
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The next time we touch this we should either switch to an unnumbered list or number them all 1. and let the markdown renderer number them, to minimize merge conflicts
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Real DynamoDB rejects PutItem / UpdateItem / BatchWriteItem.PutRequest / TransactWriteItems.Put / ImportTable items whose Map or List values nest beyond 32 total levels (31 wrappers above a scalar) with ValidationException. ExtendDB previously accepted them. Closes the L-1 Attribute nesting depth row in docs/technical-debt.md and flips docs/dynamodb-limits.md from Not enforced to Enforced.
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What
DynamoDB rejects items whose
MaporListvalues exceed 32 total nesting levels (31 wrappers above a scalar) withValidationException("Nesting Levels have exceeded supported limits"), per https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Constraints.html.The cap applies to values that get stored as item attributes:
PutItem.Item,UpdateItem.AttributeUpdates.<n>.Value,UpdateItem.UpdateExpressionSET targets resolved throughExpressionAttributeValues,BatchWriteItem.PutRequest.Item,TransactWriteItems.Put.Item, the sameSET-via-EAV (ExpressionAttributeValues) path insideTransactWriteItems.Update,ImportTableper-item contentWhy
Closes the
L-1 Attribute nesting depthtech-debt indocs/technical-debt.mdand theAttribute nesting depth (32 levels)entry indocs/dynamodb-limits.md"Unenforced Limits Requiring Tracking".Testing done
New tests added:
crates/core/src/validation/mod.rs(boundary, mixedMap/List, iterator helper, recursion-coverage on multiple top-level attributes / wideMap/ wideList).crates/core/src/expression/resolver.rs(direct reference, function args, arithmetic, nested function, path-only).tests/test_item_operations.py::TestNestingDepthDocumentation
docs/dynamodb-limits.md: flips theAttribute nesting depthrow in the Items table fromNot enforcedtoEnforced, points atvalidate_item_nesting_depthand the call sites, removes the limit from theUnenforced Limits Requiring Trackingchecklist, and updates the enforcement-coverage summary (Items: 5/0/1 → 6/0/0; Total: 28/0/18 → 29/0/17).docs/technical-debt.md: removes theL-1 Attribute nesting depthrow fromUnenforced DynamoDB Limitsand renumbers the remaining entries.Checklist
cargo test --workspace)cargo fmt --check)cargo clippy --all-targets --workspace -- -D warnings)Breaking changes
None.
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