Class: EqualityChecker

Defined in: packages/core/src/visitors/equality-checker.ts:23

Checks for equality between two plan operator trees.

Extended by

• SQLEqualityChecker
• XQueryEqualityChecker

Implements

• PlanVisitor<boolean, EcDescentArgs>

Constructors

Constructor

new EqualityChecker(vmap): EqualityChecker

Defined in: packages/core/src/visitors/equality-checker.ts:24

Parameters

Parameter	Type	Description
vmap	Record<string, PlanVisitor<boolean, EcDescentArgs>>	Per-language visitor map used for recursive descent.

Returns

EqualityChecker

Properties

vmap

protected vmap: Record<string, PlanVisitor<boolean, EcDescentArgs>>

Defined in: packages/core/src/visitors/equality-checker.ts:26

Per-language visitor map used for recursive descent.

Methods

areEqual()

areEqual(op1, op2, options?): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:109

if options.renameMap is provided, it will be used to rename the items in the op2 before comparing.

Parameters

Parameter	Type
op1	OpOrId
op2	OpOrId
options?	{ ignoreLang?: boolean; renameMap?: RenameMap; }
options.ignoreLang?	boolean
options.renameMap?	RenameMap

Returns

boolean

---

maybeRename()

protected maybeRename(id, renameMap?): ASTIdentifier

Defined in: packages/core/src/visitors/equality-checker.ts:33

Returns id renamed according to renameMap, or id unchanged when the map is absent or does not contain an entry for id.

Parameters

Parameter	Type
id	ASTIdentifier
renameMap?	RenameMap

Returns

ASTIdentifier

---

processArray()

protected processArray(arrA, arrB, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:93

Returns true only when arrA and arrB have the same length and every element pair compares equal via processItem.

Parameters

Parameter	Type
arrA	OpOrId[]
arrB	OpOrId[]
args	EcDescentArgs

Returns

boolean

---

processItem()

protected processItem(operator, __namedParameters): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:43

Compares operator against other, optionally applying renameMap to identifiers from other. Handles the special case where one side is a bare identifier and the other is an identity FnCall(ret1, [id]).

Parameters

Parameter	Type
operator	OpOrId
__namedParameters	{ ignoreLang: boolean; other: OpOrId; renameMap?: RenameMap; }
__namedParameters.ignoreLang	boolean
__namedParameters.other	OpOrId
__namedParameters.renameMap?	RenameMap

Returns

boolean

---

visitAggregate()

visitAggregate(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:339

Parameters

Parameter	Type
a	AggregateCall
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitAggregate

---

visitBidirectionalRecursion()

visitBidirectionalRecursion(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:383

Parameters

Parameter	Type
a	BidirectionalRecursion
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitBidirectionalRecursion

---

visitCalculation()

visitCalculation(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:182

Parameters

Parameter	Type
a	Calculation
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitCalculation

---

visitCartesianProduct()

visitCartesianProduct(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:207

Parameters

Parameter	Type
a	CartesianProduct
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitCartesianProduct

---

visitConditional()

visitConditional(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:192

Parameters

Parameter	Type
a	Conditional
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitConditional

---

visitDifference()

visitDifference(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:311

Parameters

Parameter	Type
a	Difference
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitDifference

---

visitDistinct()

visitDistinct(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:314

Parameters

Parameter	Type
a	Distinct
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitDistinct

---

visitFnCall()

visitFnCall(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:164

Parameters

Parameter	Type
a	FnCall
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitFnCall

---

visitGroupBy()

visitGroupBy(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:275

Parameters

Parameter	Type
a	GroupBy
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitGroupBy

---

visitIndexedRecursion()

visitIndexedRecursion(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:370

Parameters

Parameter	Type
a	IndexedRecursion
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitIndexedRecursion

---

visitIndexScan()

visitIndexScan(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:363

Parameters

Parameter	Type
a	IndexScan
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitIndexScan

---

visitIntersection()

visitIntersection(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:308

Parameters

Parameter	Type
a	Intersection
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitIntersection

---

visitItemFnSource()

visitItemFnSource(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:348

Parameters

Parameter	Type
a	ItemFnSource
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitItemFnSource

---

visitItemSource()

visitItemSource(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:153

Parameters

Parameter	Type
a	ItemSource
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitItemSource

---

visitJoin()

visitJoin(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:217

Parameters

Parameter	Type
a	Join
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitJoin

---

visitLimit()

visitLimit(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:290

Parameters

Parameter	Type
a	Limit
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitLimit

---

visitLiteral()

visitLiteral(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:178

Parameters

Parameter	Type
a	Literal
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitLiteral

---

visitMapFromItem()

visitMapFromItem(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:246

Parameters

Parameter	Type
a	MapFromItem
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitMapFromItem

---

visitMapToItem()

visitMapToItem(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:239

Parameters

Parameter	Type
a	MapToItem
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitMapToItem

---

visitNullSource()

visitNullSource(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:336

Parameters

Parameter	Type
a	NullSource
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitNullSource

---

visitOrderBy()

visitOrderBy(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:260

Parameters

Parameter	Type
a	OrderBy
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitOrderBy

---

visitProjection()

visitProjection(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:129

Parameters

Parameter	Type
a	Projection
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitProjection

---

visitProjectionConcat()

visitProjectionConcat(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:226

Parameters

Parameter	Type
a	ProjectionConcat
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitProjectionConcat

---

visitProjectionIndex()

visitProjectionIndex(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:253

Parameters

Parameter	Type
a	ProjectionIndex
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitProjectionIndex

---

visitQuantifier()

visitQuantifier(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:356

Parameters

Parameter	Type
a	Quantifier
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitQuantifier

---

visitRecursion()

visitRecursion(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:119

Parameters

Parameter	Type
a	Recursion
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitRecursion

---

visitSelection()

visitSelection(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:143

Parameters

Parameter	Type
a	Selection
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitSelection

---

visitSetOp()

protected visitSetOp(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:298

Parameters

Parameter	Type
a	SetOperator
args	EcDescentArgs

Returns

boolean

---

visitTupleFnSource()

visitTupleFnSource(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:352

Parameters

Parameter	Type
a	TupleFnSource
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitTupleFnSource

---

visitTupleSource()

visitTupleSource(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:150

Parameters

Parameter	Type
a	TupleSource
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitTupleSource

---

visitUnion()

visitUnion(a, args): boolean

Defined in: packages/core/src/visitors/equality-checker.ts:305

Parameters

Parameter	Type
a	Union
args	EcDescentArgs

Returns

boolean

Implementation of

PlanVisitor.visitUnion