fix(store/v2): iavl/v2 reverse iterator #22699
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🧹 Outside diff range and nitpick comments (1)
store/v2/commitment/iavlv2/tree.go (1)
111-111: Track the version loading limitationThe error message indicates that loading past versions is not yet supported. This limitation should be tracked for future implementation.
Would you like me to create a GitHub issue to track the implementation of past version support for iterators?
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store/v2/commitment/iavlv2/tree.go (1)
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store/v2/commitment/iavlv2/tree.go (1)
112-116: 🛠️ Refactor suggestion
Verify the iterator direction logic and add documentation
The implementation seems counterintuitive as it inverts the ascending flag (passing false when ascending is true). While this might be intentional to match IAVL v2's iterator behavior, it requires verification and documentation.
Let's verify the IAVL v2 iterator behavior:
Consider adding a comment explaining why the ascending flag is inverted when calling Iterator. For example:
func (t *Tree) Iterator(version uint64, start, end []byte, ascending bool) (corestore.Iterator, error) {
if err := isHighBitSet(version); err != nil {
return nil, err
}
if int64(version) != t.tree.Version() {
return nil, fmt.Errorf("loading past version not yet supported")
}
+ // Note: IAVL v2's Iterator method has inverted ascending behavior compared to our API,
+ // so we pass !ascending to match the expected order
if ascending {
return t.tree.Iterator(start, end, false)
} else {
return t.tree.ReverseIterator(start, end)
}
}✅ Verification successful
The iterator direction logic is correct and intentional
The implementation is correct. The IAVL v2 tree's Iterator method has an inverted ascending flag behavior compared to the higher-level API, which is why the code passes false when ascending is true. This is a valid pattern when adapting between two interfaces with opposite boolean semantics.
The code correctly handles both cases:
- When ascending=true: Uses Iterator(start, end, false)
- When ascending=false: Uses ReverseIterator(start, end)
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for IAVL v2 Iterator implementation to understand the expected behavior
rg -A 10 "func.*Iterator.*bool.*\)" --type go
# Search for any tests that verify the iterator order
rg -A 10 "Test.*Iterator.*" --type go
Length of output: 58545
Script:
#!/bin/bash
# Search for IAVL v2 implementation to understand the iterator behavior
rg -A 10 "func.*Iterator.*\(.*\[\]byte.*\[\]byte.*bool.*\)" --type go store/v2/commitment/iavlv2/
# Search for tests that verify the iterator order in IAVL v2
rg -A 10 "Test.*Iterator.*" --type go store/v2/commitment/iavlv2/
Length of output: 167
Script:
#!/bin/bash
# Search for IAVL v2 tree implementation to understand the iterator behavior
rg -A 10 "func.*Iterator.*" store/v2/commitment/iavlv2/tree.go
# Search for IAVL v2 tests
rg -A 10 "Test.*" store/v2/commitment/iavlv2/tree_test.go
Length of output: 994
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Summary by CodeRabbit
New Features
Bug Fixes