Class: ProjectionSize

Defined in: lang-xquery/src/plan/projection-size.ts:10

Plan operator that computes the sequence length for each group of tuples and appends it as sizeCol, making the XQuery fn:last() context value available downstream.

Extends

• PlanTupleOperator

Constructors

Constructor

new ProjectionSize(lang, sizeCol, source): ProjectionSize

Defined in: lang-xquery/src/plan/projection-size.ts:11

Parameters

Parameter	Type	Description
lang	Lowercase<string>	-
sizeCol	ASTIdentifier	Column identifier that receives the computed sequence length.
source	PlanTupleOperator	The upstream tuple stream whose tuples are grouped and sized.

Returns

ProjectionSize

Overrides

PlanTupleOperator.constructor

Properties

lang

lang: Lowercase<string>

Defined in: core/dist/plan/visitor.d.ts:36

PlanOperator.lang

Inherited from

PlanTupleOperator.lang

---

parent?

optional parent?: PlanOperator

Defined in: core/dist/plan/visitor.d.ts:38

PlanOperator.parent

Inherited from

PlanTupleOperator.parent

---

schema

schema: ASTIdentifier[]

Defined in: core/dist/plan/visitor.d.ts:32

Ordered list of attribute identifiers produced by this operator.

Inherited from

PlanTupleOperator.schema

---

schemaSet

schemaSet: IdSet

Defined in: core/dist/plan/visitor.d.ts:34

Trie-backed set of the same paths as schema; used for O(k) membership tests.

Inherited from

PlanTupleOperator.schemaSet

---

sizeCol

sizeCol: ASTIdentifier

Defined in: lang-xquery/src/plan/projection-size.ts:14

Column identifier that receives the computed sequence length.

---

source

source: PlanTupleOperator

Defined in: lang-xquery/src/plan/projection-size.ts:16

The upstream tuple stream whose tuples are grouped and sized.

Methods

accept()

accept<Ret, Arg>(visitors, arg?): Ret

Defined in: lang-xquery/src/plan/projection-size.ts:26

Dispatches to visitors[this.lang].visitProjectionSize.

Type Parameters

Type Parameter
Ret
Arg

Parameters

Parameter	Type
visitors	Record<string, XQueryPlanVisitor<Ret, Arg>>
arg?	Arg

Returns

Ret

Overrides

PlanTupleOperator.accept

---

addToSchema()

addToSchema(item): void

Defined in: core/dist/plan/visitor.d.ts:46

will preserve object references

Parameters

Parameter	Type
item	ASTIdentifier | IdSet | ASTIdentifier[]

Returns

void

Inherited from

PlanTupleOperator.addToSchema

---

clearSchema()

clearSchema(): void

Defined in: core/dist/plan/visitor.d.ts:50

will preserve object references

Returns

void

Inherited from

PlanTupleOperator.clearSchema

---

clone()

clone(): ProjectionSize

Defined in: lang-xquery/src/plan/projection-size.ts:48

Returns a deep copy with a cloned source.

Returns

ProjectionSize

Overrides

PlanTupleOperator.clone

---

getChildren()

getChildren(): PlanOperator[]

Defined in: lang-xquery/src/plan/projection-size.ts:44

Returns [this.source].

Returns

PlanOperator[]

Overrides

PlanTupleOperator.getChildren

---

getDependencies()

getDependencies(): IdSet

Defined in: core/dist/plan/visitor.d.ts:54

PlanOperator.getDependencies

Returns

IdSet

Inherited from

PlanTupleOperator.getDependencies

---

removeFromSchema()

removeFromSchema(item): boolean

Defined in: core/dist/plan/visitor.d.ts:48

will preserve object references

Parameters

Parameter	Type
item	ASTIdentifier | IdSet | ASTIdentifier[]

Returns

boolean

Inherited from

PlanTupleOperator.removeFromSchema

---

replaceChild()

replaceChild(current, replacement): void

Defined in: lang-xquery/src/plan/projection-size.ts:33

Swaps source and recomputes the output schema, preserving sizeCol as the last column.

Parameters

Parameter	Type
current	PlanTupleOperator
replacement	PlanTupleOperator

Returns

void

Overrides

PlanTupleOperator.replaceChild