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trie/bintrie: remove hasParent dead code in getValuesAtStem

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Gballet (comment 3101708418): the hasParent check in the kindHashed
branch never fires — NewBinaryTrie resolves the root eagerly at open
time, so any HashedNode we encounter during a getValuesAtStem walk is
necessarily a child of a previously-visited internal (parentIdx /
parentIsLeft set on the prior kindInternal iteration).

Drop the hasParent flag and its setter; replace the check with a short
comment stating the invariant.
This commit is contained in:
CPerezz 2026-04-18 18:57:56 +02:00
parent 33227e7e6d
commit aa21cd1b80
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GPG key ID: 62045F34B97177DD
1 changed files with 3 additions and 5 deletions
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8
trie/bintrie/store_ops.go
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@ -46,7 +46,6 @@ func (s *NodeStore) getValuesAtStem(ref nodeRef, stem []byte, resolver NodeResol
cur := ref
var parentIdx uint32
var parentIsLeft bool
hasParent := false
for {
switch cur.Kind() {
@ -57,7 +56,6 @@ func (s *NodeStore) getValuesAtStem(ref nodeRef, stem []byte, resolver NodeResol
}
bit := stem[node.depth/8] >> (7 - (node.depth % 8)) & 1
parentIdx = cur.Index()
hasParent = true
if bit == 0 {
parentIsLeft = true
cur = node.left
@ -74,9 +72,9 @@ func (s *NodeStore) getValuesAtStem(ref nodeRef, stem []byte, resolver NodeResol
return sn.allValues(), nil
case kindHashed:
if !hasParent {
return nil, errors.New("getValuesAtStem: hashed node at root")
}
// HashedNode at root is impossible: NewBinaryTrie resolves the
// root eagerly before any query. Any HashedNode we encounter here
// is necessarily a child of a previously-visited internal node.
if resolver == nil {
return nil, errors.New("getValuesAtStem: cannot resolve hashed node without resolver")
}