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Collapse the whole subject wire in materialized folds

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Dennis Kobert
2026-08-22 19:11:48 +00:00
parent 7b993c5de6
commit a2918887f6
3 changed files with 21 additions and 63 deletions
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12
node-graph/libraries/core-types/src/record.rs
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@@ -325,9 +325,8 @@ pub struct LayoutMeta {
/// The depth change the node applies: `0` for elementwise and flip nodes,
/// `+1` for a creator, `-1` for a reducer.
pub level_delta: i8,
/// The materialized subject a reducer folds, as `(input, levels)`: the
/// output keeps the subject's levels above the folded ones, so the depth
/// derives from its layout even though it contributes no fields.
/// The materialized subject a reducer folds, as `(input, levels)`. The fold
/// consumes the whole subject wire, so only the node's own levels remain.
pub folded: Option<(u8, u8)>,
}
@@ -375,10 +374,9 @@ impl LayoutMeta {
}
.without(&self.removes);
let depth = match self.folded {
Some((input, levels)) => {
let subject = inputs[input as usize].expect("layout fold folded input has no layout");
(subject.depth.saturating_sub(levels) as i8 + self.level_delta).max(0) as u8
}
// A fold consumes the whole subject wire (a deeper wire folds its
// total flat span), so only the node's own levels remain.
Some(_) => self.level_delta.max(0) as u8,
None => (base.depth as i8 + self.level_delta).max(0) as u8,
};
let element = match &self.element {