struct FromModel {
    id_gen: IdGen,
    converted: Vec<HirRelationExpr>,
    lets: Vec<(LocalId, HirRelationExpr, RelationType)>,
    common_subgraphs: HashMap<BoxId, usize>,
}

Fields§

§id_gen: IdGen

Generates mz_expr::LocalId as an alias for common expressions.

§converted: Vec<HirRelationExpr>

Stack of HirRelationExpr that have been created through visiting nodes of QGM in post-order.

§lets: Vec<(LocalId, HirRelationExpr, RelationType)>

Common expressions that have been given a mz_expr::LocalId, from oldest to most recently identified.

§common_subgraphs: HashMap<BoxId, usize>

Map of (BoxIds whose HIR representation has been given a mz_expr::LocalId) -> (position of its HIR representation in lets)

Implementations§

Convert subgraph rooted at box_id to HirRelationExpr.

If the box corresponding to box_id has multiple ranging quantifiers, the HirRelationExpr will be in self.lets, and it can be looked up in self.common_subgraphs. Otherwise, it will be pushed to self.converted.

Convert the quantifiers of box into HirRelationExpr and HirScalarExpr.

Results are returned in reverse quantifier order; the last entry in the second vector corresponds to the first subquery quantifier in the box.

Convert the projection of a box into a Map + Project around the HirRelationExpr representing the rest of the box.

Trait Implementations§

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Auto Trait Implementations§

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