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Avoid resetting cursor on no-op seek #334

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Avoid resetting cursor on no-op seek #334

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7 changes: 5 additions & 2 deletions src/trace/layers/ordered.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -262,8 +262,11 @@ where
}
}
fn seek(&mut self, storage: &OrderedLayer<K, L, O>, key: &Self::Key) {
self.pos += advance(&storage.keys[self.pos .. self.bounds.1], |k| k.lt(key));
if self.valid(storage) {
let step = advance(&storage.keys[self.pos .. self.bounds.1], |k| k.lt(key));
self.pos += step;
// Only reposition the child cursor if this cursor strictly advanced.
// If this cursor did not advance, we do not want to reset the child cursor.
if self.valid(storage) && step > 0 {
self.child.reposition(&storage.vals, storage.offs[self.pos].try_into().unwrap(), storage.offs[self.pos + 1].try_into().unwrap());
}
}
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