icydb_core/db/query/intent/
query.rs

1//! Module: query::intent::query
2//! Responsibility: typed query-intent construction and planner handoff for entity queries.
3//! Does not own: runtime execution semantics or access-path execution behavior.
4//! Boundary: exposes query APIs and emits planner-owned compiled query contracts.
5
6#[cfg(feature = "sql")]
7use crate::db::query::plan::expr::ProjectionSelection;
8use crate::{
9    db::{
10        predicate::{CompareOp, MissingRowPolicy, Predicate},
11        query::{
12            builder::AggregateExpr,
13            explain::ExplainPlan,
14            expr::FilterExpr,
15            expr::OrderTerm as FluentOrderTerm,
16            intent::{QueryError, QueryModel},
17            plan::{
18                AccessPlannedQuery, LoadSpec, OrderSpec, PreparedScalarPlanningState, QueryMode,
19                VisibleIndexes, expr::Expr,
20            },
21        },
22        schema::SchemaInfo,
23    },
24    traits::{EntityKind, KeyValueCodec, SingletonEntity},
25    value::{InputValue, Value},
26};
27use core::marker::PhantomData;
28
29///
30/// StructuralQuery
31///
32/// Generic-free query-intent core shared by typed `Query<E>` wrappers.
33/// Stores model-level key access as `Value` so only typed key-entry helpers
34/// remain entity-specific at the outer API boundary.
35///
36
37#[derive(Clone, Debug)]
38pub(in crate::db) struct StructuralQuery {
39    intent: QueryModel<'static, Value>,
40}
41
42impl StructuralQuery {
43    #[must_use]
44    pub(in crate::db) const fn new(
45        model: &'static crate::model::entity::EntityModel,
46        consistency: MissingRowPolicy,
47    ) -> Self {
48        Self {
49            intent: QueryModel::new(model, consistency),
50        }
51    }
52
53    // Rewrap one updated generic-free intent model back into the structural
54    // query shell so local transformation helpers do not rebuild `Self`
55    // ad hoc at each boundary method.
56    const fn from_intent(intent: QueryModel<'static, Value>) -> Self {
57        Self { intent }
58    }
59
60    // Apply one infallible intent transformation while preserving the
61    // structural query shell at this boundary.
62    fn map_intent(
63        self,
64        map: impl FnOnce(QueryModel<'static, Value>) -> QueryModel<'static, Value>,
65    ) -> Self {
66        Self::from_intent(map(self.intent))
67    }
68
69    // Apply one fallible intent transformation while keeping result wrapping
70    // local to the structural query boundary.
71    fn try_map_intent(
72        self,
73        map: impl FnOnce(QueryModel<'static, Value>) -> Result<QueryModel<'static, Value>, QueryError>,
74    ) -> Result<Self, QueryError> {
75        map(self.intent).map(Self::from_intent)
76    }
77
78    #[must_use]
79    const fn mode(&self) -> QueryMode {
80        self.intent.mode()
81    }
82
83    #[must_use]
84    fn has_explicit_order(&self) -> bool {
85        self.intent.has_explicit_order()
86    }
87
88    #[must_use]
89    pub(in crate::db) const fn has_grouping(&self) -> bool {
90        self.intent.has_grouping()
91    }
92
93    #[must_use]
94    const fn load_spec(&self) -> Option<LoadSpec> {
95        match self.intent.mode() {
96            QueryMode::Load(spec) => Some(spec),
97            QueryMode::Delete(_) => None,
98        }
99    }
100
101    #[must_use]
102    pub(in crate::db) fn filter_predicate(mut self, predicate: Predicate) -> Self {
103        self.intent = self.intent.filter_predicate(predicate);
104        self
105    }
106
107    #[must_use]
108    pub(in crate::db) fn filter(mut self, expr: impl Into<FilterExpr>) -> Self {
109        self.intent = self.intent.filter(expr.into());
110        self
111    }
112
113    #[must_use]
114    pub(in crate::db) fn filter_expr_with_normalized_predicate(
115        mut self,
116        expr: Expr,
117        predicate: Predicate,
118    ) -> Self {
119        self.intent = self
120            .intent
121            .filter_expr_with_normalized_predicate(expr, predicate);
122        self
123    }
124    pub(in crate::db) fn order_term(mut self, term: FluentOrderTerm) -> Self {
125        self.intent = self.intent.order_term(term);
126        self
127    }
128
129    // Keep the exact expression-owned scalar filter lane available for
130    // internal SQL lowering and parity callers that must preserve one planner
131    // expression without routing through the public typed `FilterExpr` surface.
132    #[must_use]
133    pub(in crate::db) fn filter_expr(mut self, expr: Expr) -> Self {
134        self.intent = self.intent.filter_expr(expr);
135        self
136    }
137
138    #[must_use]
139    pub(in crate::db) fn order_spec(mut self, order: OrderSpec) -> Self {
140        self.intent = self.intent.order_spec(order);
141        self
142    }
143
144    #[must_use]
145    pub(in crate::db) fn distinct(mut self) -> Self {
146        self.intent = self.intent.distinct();
147        self
148    }
149
150    #[cfg(all(test, feature = "sql"))]
151    #[must_use]
152    pub(in crate::db) fn select_fields<I, S>(mut self, fields: I) -> Self
153    where
154        I: IntoIterator<Item = S>,
155        S: Into<String>,
156    {
157        self.intent = self.intent.select_fields(fields);
158        self
159    }
160
161    #[cfg(feature = "sql")]
162    #[must_use]
163    pub(in crate::db) fn projection_selection(mut self, selection: ProjectionSelection) -> Self {
164        self.intent = self.intent.projection_selection(selection);
165        self
166    }
167
168    /// Select one scalar field projection by canonical field id.
169    ///
170    /// This keeps SQL mutation execution from reconstructing projection shape
171    /// variants after lowering has already selected the mutation target query.
172    #[cfg(feature = "sql")]
173    #[must_use]
174    pub(in crate::db) fn select_field_id(mut self, field: impl Into<String>) -> Self {
175        self.intent = self.intent.select_field_id(field);
176        self
177    }
178
179    pub(in crate::db) fn group_by(self, field: impl AsRef<str>) -> Result<Self, QueryError> {
180        self.try_map_intent(|intent| intent.push_group_field(field.as_ref()))
181    }
182
183    #[must_use]
184    pub(in crate::db) fn aggregate(mut self, aggregate: AggregateExpr) -> Self {
185        self.intent = self.intent.push_group_aggregate(aggregate);
186        self
187    }
188
189    #[must_use]
190    fn grouped_limits(mut self, max_groups: u64, max_group_bytes: u64) -> Self {
191        self.intent = self.intent.grouped_limits(max_groups, max_group_bytes);
192        self
193    }
194
195    pub(in crate::db) fn having_group(
196        self,
197        field: impl AsRef<str>,
198        op: CompareOp,
199        value: Value,
200    ) -> Result<Self, QueryError> {
201        let field = field.as_ref().to_owned();
202        self.try_map_intent(|intent| intent.push_having_group_clause(&field, op, value))
203    }
204
205    pub(in crate::db) fn having_aggregate(
206        self,
207        aggregate_index: usize,
208        op: CompareOp,
209        value: Value,
210    ) -> Result<Self, QueryError> {
211        self.try_map_intent(|intent| {
212            intent.push_having_aggregate_clause(aggregate_index, op, value)
213        })
214    }
215
216    #[cfg(test)]
217    pub(in crate::db) fn having_expr(self, expr: Expr) -> Result<Self, QueryError> {
218        self.try_map_intent(|intent| intent.push_having_expr(expr))
219    }
220
221    pub(in crate::db) fn having_expr_preserving_shape(
222        self,
223        expr: Expr,
224    ) -> Result<Self, QueryError> {
225        self.try_map_intent(|intent| intent.push_having_expr_preserving_shape(expr))
226    }
227
228    #[must_use]
229    fn by_id(self, id: Value) -> Self {
230        self.map_intent(|intent| intent.by_id(id))
231    }
232
233    #[must_use]
234    fn by_ids<I>(self, ids: I) -> Self
235    where
236        I: IntoIterator<Item = Value>,
237    {
238        self.map_intent(|intent| intent.by_ids(ids))
239    }
240
241    #[must_use]
242    fn only(self, id: Value) -> Self {
243        self.map_intent(|intent| intent.only(id))
244    }
245
246    #[must_use]
247    pub(in crate::db) fn delete(mut self) -> Self {
248        self.intent = self.intent.delete();
249        self
250    }
251
252    #[must_use]
253    pub(in crate::db) fn limit(mut self, limit: u32) -> Self {
254        self.intent = self.intent.limit(limit);
255        self
256    }
257
258    #[must_use]
259    pub(in crate::db) fn offset(mut self, offset: u32) -> Self {
260        self.intent = self.intent.offset(offset);
261        self
262    }
263
264    pub(in crate::db) fn build_plan(&self) -> Result<AccessPlannedQuery, QueryError> {
265        self.intent.build_plan_model()
266    }
267
268    pub(in crate::db) fn build_plan_with_visible_indexes(
269        &self,
270        visible_indexes: &VisibleIndexes<'_>,
271    ) -> Result<AccessPlannedQuery, QueryError> {
272        self.intent.build_plan_model_with_indexes(visible_indexes)
273    }
274
275    pub(in crate::db) fn prepare_scalar_planning_state_with_schema_info(
276        &self,
277        schema_info: SchemaInfo,
278    ) -> Result<PreparedScalarPlanningState<'_>, QueryError> {
279        self.intent
280            .prepare_scalar_planning_state_with_schema_info(schema_info)
281    }
282
283    pub(in crate::db) fn build_plan_with_visible_indexes_from_scalar_planning_state(
284        &self,
285        visible_indexes: &VisibleIndexes<'_>,
286        planning_state: PreparedScalarPlanningState<'_>,
287    ) -> Result<AccessPlannedQuery, QueryError> {
288        self.intent
289            .build_plan_model_with_indexes_from_scalar_planning_state(
290                visible_indexes,
291                planning_state,
292            )
293    }
294
295    pub(in crate::db) fn try_build_trivial_scalar_load_plan(
296        &self,
297    ) -> Result<Option<AccessPlannedQuery>, QueryError> {
298        self.intent.try_build_trivial_scalar_load_plan()
299    }
300
301    #[must_use]
302    pub(in crate::db) fn trivial_scalar_load_fast_path_eligible(&self) -> bool {
303        self.intent.trivial_scalar_load_fast_path_eligible()
304    }
305
306    #[must_use]
307    #[cfg(test)]
308    pub(in crate::db) fn structural_cache_key(
309        &self,
310    ) -> crate::db::query::intent::StructuralQueryCacheKey {
311        crate::db::query::intent::StructuralQueryCacheKey::from_query_model(&self.intent)
312    }
313
314    #[must_use]
315    pub(in crate::db) fn structural_cache_key_with_normalized_predicate_fingerprint(
316        &self,
317        predicate_fingerprint: Option<[u8; 32]>,
318    ) -> crate::db::query::intent::StructuralQueryCacheKey {
319        self.intent
320            .structural_cache_key_with_normalized_predicate_fingerprint(predicate_fingerprint)
321    }
322
323    // Build one access plan using either schema-owned indexes or the session
324    // visibility slice already resolved at the caller boundary.
325    fn build_plan_for_visibility(
326        &self,
327        visible_indexes: Option<&VisibleIndexes<'_>>,
328    ) -> Result<AccessPlannedQuery, QueryError> {
329        match visible_indexes {
330            Some(visible_indexes) => self.build_plan_with_visible_indexes(visible_indexes),
331            None => self.build_plan(),
332        }
333    }
334
335    #[must_use]
336    pub(in crate::db) const fn model(&self) -> &'static crate::model::entity::EntityModel {
337        self.intent.model()
338    }
339}
340
341///
342/// QueryPlanHandle
343///
344/// QueryPlanHandle stores the neutral access-planned query owned by the query
345/// layer. Executor-specific prepared-plan caching remains outside this DTO, so
346/// query values do not depend on executor runtime contracts.
347///
348
349#[derive(Clone, Debug)]
350struct QueryPlanHandle {
351    plan: Box<AccessPlannedQuery>,
352}
353
354impl QueryPlanHandle {
355    #[must_use]
356    fn from_plan(plan: AccessPlannedQuery) -> Self {
357        Self {
358            plan: Box::new(plan),
359        }
360    }
361
362    #[must_use]
363    const fn logical_plan(&self) -> &AccessPlannedQuery {
364        &self.plan
365    }
366
367    #[must_use]
368    #[cfg(test)]
369    fn into_inner(self) -> AccessPlannedQuery {
370        *self.plan
371    }
372}
373
374///
375/// PlannedQuery
376///
377/// PlannedQuery keeps the typed planning surface stable while allowing the
378/// session boundary to reuse one shared prepared-plan artifact internally.
379///
380
381#[derive(Debug)]
382pub struct PlannedQuery<E: EntityKind> {
383    plan: QueryPlanHandle,
384    _marker: PhantomData<E>,
385}
386
387impl<E: EntityKind> PlannedQuery<E> {
388    #[must_use]
389    pub(in crate::db) fn from_plan(plan: AccessPlannedQuery) -> Self {
390        Self {
391            plan: QueryPlanHandle::from_plan(plan),
392            _marker: PhantomData,
393        }
394    }
395
396    #[must_use]
397    pub fn explain(&self) -> ExplainPlan {
398        self.plan.logical_plan().explain()
399    }
400
401    /// Return the stable plan hash for this planned query.
402    #[must_use]
403    pub fn plan_hash_hex(&self) -> String {
404        self.plan.logical_plan().fingerprint().to_string()
405    }
406}
407
408///
409/// CompiledQuery
410///
411/// Typed compiled-query shell over one structural planner contract.
412/// The outer entity marker preserves executor handoff inference without
413/// carrying a second adapter object, while session-owned paths can still reuse
414/// the cached shared prepared plan directly.
415///
416
417#[derive(Clone, Debug)]
418pub struct CompiledQuery<E: EntityKind> {
419    plan: QueryPlanHandle,
420    _marker: PhantomData<E>,
421}
422
423impl<E: EntityKind> CompiledQuery<E> {
424    #[must_use]
425    pub(in crate::db) fn from_plan(plan: AccessPlannedQuery) -> Self {
426        Self {
427            plan: QueryPlanHandle::from_plan(plan),
428            _marker: PhantomData,
429        }
430    }
431
432    #[must_use]
433    pub fn explain(&self) -> ExplainPlan {
434        self.plan.logical_plan().explain()
435    }
436
437    /// Return the stable plan hash for this compiled query.
438    #[must_use]
439    pub fn plan_hash_hex(&self) -> String {
440        self.plan.logical_plan().fingerprint().to_string()
441    }
442
443    #[must_use]
444    #[cfg(test)]
445    pub(in crate::db) fn projection_spec(&self) -> crate::db::query::plan::expr::ProjectionSpec {
446        self.plan.logical_plan().projection_spec(E::MODEL)
447    }
448
449    /// Convert one compiled query back into the neutral planned-query contract.
450    #[cfg(test)]
451    pub(in crate::db) fn into_plan(self) -> AccessPlannedQuery {
452        self.plan.into_inner()
453    }
454
455    #[must_use]
456    #[cfg(test)]
457    pub(in crate::db) fn into_inner(self) -> AccessPlannedQuery {
458        self.plan.into_inner()
459    }
460}
461
462///
463/// Query
464///
465/// Typed, declarative query intent for a specific entity type.
466///
467/// This intent is:
468/// - schema-agnostic at construction
469/// - normalized and validated only during planning
470/// - free of access-path decisions
471///
472
473#[derive(Debug)]
474pub struct Query<E: EntityKind> {
475    inner: StructuralQuery,
476    _marker: PhantomData<E>,
477}
478
479impl<E: EntityKind> Query<E> {
480    // Rebind one structural query core to the typed `Query<E>` surface.
481    pub(in crate::db) const fn from_inner(inner: StructuralQuery) -> Self {
482        Self {
483            inner,
484            _marker: PhantomData,
485        }
486    }
487
488    /// Create a new intent with an explicit missing-row policy.
489    /// Ignore favors idempotency and may mask index/data divergence on deletes.
490    /// Use Error to surface missing rows during scan/delete execution.
491    #[must_use]
492    pub const fn new(consistency: MissingRowPolicy) -> Self {
493        Self::from_inner(StructuralQuery::new(E::MODEL, consistency))
494    }
495
496    /// Return the intent mode (load vs delete).
497    #[must_use]
498    pub const fn mode(&self) -> QueryMode {
499        self.inner.mode()
500    }
501
502    #[cfg(test)]
503    pub(in crate::db) fn explain_with_visible_indexes(
504        &self,
505        visible_indexes: &VisibleIndexes<'_>,
506    ) -> Result<ExplainPlan, QueryError> {
507        let plan = self.build_plan_for_visibility(Some(visible_indexes))?;
508
509        Ok(plan.explain())
510    }
511
512    #[cfg(test)]
513    pub(in crate::db) fn plan_hash_hex_with_visible_indexes(
514        &self,
515        visible_indexes: &VisibleIndexes<'_>,
516    ) -> Result<String, QueryError> {
517        let plan = self.build_plan_for_visibility(Some(visible_indexes))?;
518
519        Ok(plan.fingerprint().to_string())
520    }
521
522    // Build one typed access plan using either schema-owned indexes or the
523    // visibility slice already resolved at the session boundary.
524    fn build_plan_for_visibility(
525        &self,
526        visible_indexes: Option<&VisibleIndexes<'_>>,
527    ) -> Result<AccessPlannedQuery, QueryError> {
528        self.inner.build_plan_for_visibility(visible_indexes)
529    }
530
531    // Build one structural plan for the requested visibility lane and then
532    // project it into one typed query-owned contract so planned vs compiled
533    // outputs do not each duplicate the same plan handoff shape.
534    fn map_plan_for_visibility<T>(
535        &self,
536        visible_indexes: Option<&VisibleIndexes<'_>>,
537        map: impl FnOnce(AccessPlannedQuery) -> T,
538    ) -> Result<T, QueryError> {
539        let plan = self.build_plan_for_visibility(visible_indexes)?;
540
541        Ok(map(plan))
542    }
543
544    // Wrap one built plan as the typed planned-query DTO.
545    pub(in crate::db) fn planned_query_from_plan(plan: AccessPlannedQuery) -> PlannedQuery<E> {
546        PlannedQuery::from_plan(plan)
547    }
548
549    // Wrap one built plan as the typed compiled-query DTO.
550    pub(in crate::db) fn compiled_query_from_plan(plan: AccessPlannedQuery) -> CompiledQuery<E> {
551        CompiledQuery::from_plan(plan)
552    }
553
554    #[must_use]
555    pub(in crate::db::query) fn has_explicit_order(&self) -> bool {
556        self.inner.has_explicit_order()
557    }
558
559    #[must_use]
560    pub(in crate::db) const fn structural(&self) -> &StructuralQuery {
561        &self.inner
562    }
563
564    #[must_use]
565    pub const fn has_grouping(&self) -> bool {
566        self.inner.has_grouping()
567    }
568
569    #[must_use]
570    pub(in crate::db::query) const fn load_spec(&self) -> Option<LoadSpec> {
571        self.inner.load_spec()
572    }
573
574    /// Add one typed filter expression, implicitly AND-ing with any existing filter.
575    #[must_use]
576    pub fn filter(mut self, expr: impl Into<FilterExpr>) -> Self {
577        self.inner = self.inner.filter(expr);
578        self
579    }
580
581    // Keep the internal fluent parity hook available for tests that need one
582    // exact expression-owned scalar filter shape instead of the public typed
583    // `FilterExpr` lowering path.
584    #[cfg(test)]
585    #[must_use]
586    pub(in crate::db) fn filter_expr(mut self, expr: Expr) -> Self {
587        self.inner = self.inner.filter_expr(expr);
588        self
589    }
590
591    // Keep the internal predicate-owned filter hook available for convergence
592    // tests without retaining the typed adapter in normal builds after SQL
593    // UPDATE moved to structural lowering.
594    #[cfg(test)]
595    #[must_use]
596    pub(in crate::db) fn filter_predicate(mut self, predicate: Predicate) -> Self {
597        self.inner = self.inner.filter_predicate(predicate);
598        self
599    }
600
601    /// Append one typed ORDER BY term.
602    #[must_use]
603    pub fn order_term(mut self, term: FluentOrderTerm) -> Self {
604        self.inner = self.inner.order_term(term);
605        self
606    }
607
608    /// Append multiple typed ORDER BY terms in declaration order.
609    #[must_use]
610    pub fn order_terms<I>(mut self, terms: I) -> Self
611    where
612        I: IntoIterator<Item = FluentOrderTerm>,
613    {
614        for term in terms {
615            self.inner = self.inner.order_term(term);
616        }
617
618        self
619    }
620
621    /// Enable DISTINCT semantics for this query.
622    #[must_use]
623    pub fn distinct(mut self) -> Self {
624        self.inner = self.inner.distinct();
625        self
626    }
627
628    // Keep the internal fluent SQL parity hook available for lowering tests
629    // without making generated SQL binding depend on the typed query shell.
630    #[cfg(all(test, feature = "sql"))]
631    #[must_use]
632    pub(in crate::db) fn select_fields<I, S>(mut self, fields: I) -> Self
633    where
634        I: IntoIterator<Item = S>,
635        S: Into<String>,
636    {
637        self.inner = self.inner.select_fields(fields);
638        self
639    }
640
641    /// Add one GROUP BY field.
642    pub fn group_by(self, field: impl AsRef<str>) -> Result<Self, QueryError> {
643        let Self { inner, .. } = self;
644        let inner = inner.group_by(field)?;
645
646        Ok(Self::from_inner(inner))
647    }
648
649    /// Add one aggregate terminal via composable aggregate expression.
650    #[must_use]
651    pub fn aggregate(mut self, aggregate: AggregateExpr) -> Self {
652        self.inner = self.inner.aggregate(aggregate);
653        self
654    }
655
656    /// Override grouped hard limits for grouped execution budget enforcement.
657    #[must_use]
658    pub fn grouped_limits(mut self, max_groups: u64, max_group_bytes: u64) -> Self {
659        self.inner = self.inner.grouped_limits(max_groups, max_group_bytes);
660        self
661    }
662
663    /// Add one grouped HAVING compare clause over one grouped key field.
664    pub fn having_group(
665        self,
666        field: impl AsRef<str>,
667        op: CompareOp,
668        value: InputValue,
669    ) -> Result<Self, QueryError> {
670        let Self { inner, .. } = self;
671        let inner = inner.having_group(field, op, value.into())?;
672
673        Ok(Self::from_inner(inner))
674    }
675
676    /// Add one grouped HAVING compare clause over one grouped aggregate output.
677    pub fn having_aggregate(
678        self,
679        aggregate_index: usize,
680        op: CompareOp,
681        value: InputValue,
682    ) -> Result<Self, QueryError> {
683        let Self { inner, .. } = self;
684        let inner = inner.having_aggregate(aggregate_index, op, value.into())?;
685
686        Ok(Self::from_inner(inner))
687    }
688
689    // Keep the internal fluent parity hook available for tests that need one
690    // exact grouped HAVING expression shape instead of the public grouped
691    // clause builders.
692    #[cfg(test)]
693    pub(in crate::db) fn having_expr(self, expr: Expr) -> Result<Self, QueryError> {
694        let Self { inner, .. } = self;
695        let inner = inner.having_expr(expr)?;
696
697        Ok(Self::from_inner(inner))
698    }
699
700    /// Set the access path to a single primary key lookup.
701    pub(in crate::db) fn by_id(self, id: E::Key) -> Self {
702        let Self { inner, .. } = self;
703
704        Self::from_inner(inner.by_id(id.to_key_value()))
705    }
706
707    /// Set the access path to a primary key batch lookup.
708    pub(in crate::db) fn by_ids<I>(self, ids: I) -> Self
709    where
710        I: IntoIterator<Item = E::Key>,
711    {
712        let Self { inner, .. } = self;
713
714        Self::from_inner(inner.by_ids(ids.into_iter().map(|id| id.to_key_value())))
715    }
716
717    /// Mark this intent as a delete query.
718    #[must_use]
719    pub fn delete(mut self) -> Self {
720        self.inner = self.inner.delete();
721        self
722    }
723
724    /// Apply a limit to the current mode.
725    ///
726    /// Load limits bound result size; delete limits bound mutation size.
727    /// For scalar load queries, any use of `limit` or `offset` requires an
728    /// explicit `order_term(...)` so pagination is deterministic.
729    /// GROUP BY queries use canonical grouped-key order by default.
730    #[must_use]
731    pub fn limit(mut self, limit: u32) -> Self {
732        self.inner = self.inner.limit(limit);
733        self
734    }
735
736    /// Apply an offset to the current mode.
737    ///
738    /// Scalar load pagination requires an explicit `order_term(...)`.
739    /// GROUP BY queries use canonical grouped-key order by default.
740    /// Delete mode applies this after ordering and predicate filtering.
741    #[must_use]
742    pub fn offset(mut self, offset: u32) -> Self {
743        self.inner = self.inner.offset(offset);
744        self
745    }
746
747    /// Explain this intent without executing it.
748    pub fn explain(&self) -> Result<ExplainPlan, QueryError> {
749        let plan = self.planned()?;
750
751        Ok(plan.explain())
752    }
753
754    /// Return a stable plan hash for this intent.
755    ///
756    /// The hash is derived from canonical planner contracts and is suitable
757    /// for diagnostics, explain diffing, and cache key construction.
758    pub fn plan_hash_hex(&self) -> Result<String, QueryError> {
759        let plan = self.inner.build_plan()?;
760
761        Ok(plan.fingerprint().to_string())
762    }
763
764    /// Plan this intent into a neutral planned query contract.
765    pub fn planned(&self) -> Result<PlannedQuery<E>, QueryError> {
766        self.map_plan_for_visibility(None, Self::planned_query_from_plan)
767    }
768
769    /// Compile this intent into query-owned handoff state.
770    ///
771    /// This boundary intentionally does not expose executor runtime shape.
772    pub fn plan(&self) -> Result<CompiledQuery<E>, QueryError> {
773        self.map_plan_for_visibility(None, Self::compiled_query_from_plan)
774    }
775
776    #[cfg(test)]
777    pub(in crate::db) fn plan_with_visible_indexes(
778        &self,
779        visible_indexes: &VisibleIndexes<'_>,
780    ) -> Result<CompiledQuery<E>, QueryError> {
781        self.map_plan_for_visibility(Some(visible_indexes), Self::compiled_query_from_plan)
782    }
783}
784
785impl<E> Query<E>
786where
787    E: EntityKind + SingletonEntity,
788    E::Key: Default,
789{
790    /// Set the access path to the singleton primary key.
791    pub(in crate::db) fn only(self) -> Self {
792        let Self { inner, .. } = self;
793
794        Self::from_inner(inner.only(E::Key::default().to_key_value()))
795    }
796}
icydb_core/db/query/intent/query.rs

icydb_core/db/query/intent/
query.rs
