graphrecords_query/operations/indexing/
resolve.rs

1use crate::{
2    Bare, EntityDomain, EntityReference, Explain, Failure, IndexDomain, IndexValue, Indexed,
3    Labeled, Operand, QueryResult,
4    element::{Pipeline, Preserving},
5    execution::EvaluationCache,
6    operations::{Apply, ElementKernel, ElementPipeline, Operation, OperationContext, Prepare},
7    optimizer::{OperationInputs, OptimizerHints, PlanIdentity, PlanInputs},
8    registry::operation_manifest,
9    traits::Resolve,
10};
11use graphrecords_core::GraphRecord;
12
13#[derive(Clone, Explain, Operation, OperationInputs, OptimizerHints, PlanIdentity, PlanInputs)]
14#[operation(scope = Element)]
15#[explain(label = "Resolve")]
16#[plan(optimizer_hints(allows_limit_pushdown, empty = if_any))]
17pub struct ResolveOperation;
18
19impl Prepare for ResolveOperation {
20    type Prepared<'a> = ();
21
22    fn prepare<'a>(
23        &'a self,
24        _graphrecord: &'a GraphRecord,
25        _cache: &'a EvaluationCache<'a>,
26    ) -> QueryResult<Self::Prepared<'a>> {
27        Ok(())
28    }
29}
30
31impl<E: EntityDomain, I: IndexDomain> ElementKernel<Indexed<I, IndexValue<E>>>
32    for ResolveOperation
33{
34    type Emission = Preserving;
35    type OutShape = Indexed<I, EntityReference<E>>;
36
37    fn pipeline<'a>(
38        graphrecord: &'a GraphRecord,
39        _prepared: Self::Prepared<'a>,
40    ) -> QueryResult<ElementPipeline<'a, Indexed<I, IndexValue<E>>, Self>> {
41        Ok(Pipeline::keyed(move |index, value: QueryResult<_>| {
42            value.and_then(|identifier| {
43                E::resolve_index(graphrecord, &identifier)
44                    .map_err(|error| Failure::new_at::<I, _>(Self::LABEL, error, &index))
45            })
46        }))
47    }
48}
49
50impl<E: EntityDomain> ElementKernel<Bare<IndexValue<E>>> for ResolveOperation {
51    type Emission = Preserving;
52    type OutShape = Bare<EntityReference<E>>;
53
54    fn pipeline<'a>(
55        graphrecord: &'a GraphRecord,
56        _prepared: Self::Prepared<'a>,
57    ) -> QueryResult<ElementPipeline<'a, Bare<IndexValue<E>>, Self>> {
58        Ok(Pipeline::new(move |value: QueryResult<_>| {
59            value.and_then(|identifier| {
60                E::resolve_index(graphrecord, &identifier)
61                    .map_err(|error| Failure::new(Self::LABEL, error))
62            })
63        }))
64    }
65}
66
67impl<O: Apply<ResolveOperation>> Resolve for O {
68    type ReturnOperand = O::Output;
69
70    fn resolve(&self) -> Self::ReturnOperand {
71        Self::ReturnOperand::new(OperationContext::new(self.clone(), ResolveOperation))
72    }
73}
74
75operation_manifest! {
76    ResolveOperation {
77        method: Resolve::resolve;
78        scope: element;
79
80        kernel {
81            parameters: <E: EntityDomain, I: IndexDomain>;
82            input: Indexed<I, IndexValue<E>>;
83            output: Indexed<I, EntityReference<E>>;
84            emission: Preserving;
85        }
86
87        kernel {
88            parameters: <E: EntityDomain>;
89            input: Bare<IndexValue<E>>;
90            output: Bare<EntityReference<E>>;
91            emission: Preserving;
92        }
93    }
94}
graphrecords_query/operations/indexing/resolve.rs

graphrecords_query/operations/indexing/
resolve.rs
