Class: LangSwitch

Defined in: lang-sql/src/plan/langswitch.ts:11

This operator is a temporary operator which is replaced in SchemaInferrer.

Extends

• PlanTupleOperator

Constructors

Constructor

new LangSwitch(lang, node, langCtx): LangSwitch

Defined in: lang-sql/src/plan/langswitch.ts:19

Parameters

Parameter	Type	Description
lang	Lowercase<string>	-
node	LangSwitch	The AST node containing the embedded language-switch expression.
langCtx	Record<string, unknown> & object	Shared cross-language context; the sql entry holds the current SQLLangCtx.

Returns

LangSwitch

Overrides

PlanTupleOperator.constructor

Properties

lang

lang: Lowercase<string>

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

PlanOperator.lang

Inherited from

PlanTupleOperator.lang

---

langCtx

langCtx: Record<string, unknown> & object

Defined in: lang-sql/src/plan/langswitch.ts:24

Shared cross-language context; the sql entry holds the current SQLLangCtx.

Type Declaration

sql

sql: SQLLangCtx

The SQL-specific language context for the current query scope.

---

node

node: LangSwitch

Defined in: lang-sql/src/plan/langswitch.ts:22

The AST node containing the embedded language-switch expression.

---

parent?

optional parent?: PlanOperator

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

PlanOperator.parent

Inherited from

PlanTupleOperator.parent

---

requiredCol

requiredCol: ASTIdentifier

Defined in: lang-sql/src/plan/langswitch.ts:17

IN optimization needs information about the first returned column. The schema is not known at that point, so we create a new column which is required to be returned by the subquery.

---

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

Methods

accept()

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

Defined in: lang-sql/src/plan/langswitch.ts:35

Dispatches this operator to the SQL plan visitor for the active language.

Type Parameters

Type Parameter
Ret
Arg

Parameters

Parameter	Type
visitors	Record<string, SQLPlanVisitor<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 | ASTIdentifier[] | IdSet

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(): LangSwitch

Defined in: lang-sql/src/plan/langswitch.ts:57

Returns a deep copy of this operator including schema, schema set, and requiredCol.

Returns

LangSwitch

Overrides

PlanTupleOperator.clone

---

getChildren()

getChildren(): PlanOperator[]

Defined in: lang-sql/src/plan/langswitch.ts:53

Returns an empty array; a LangSwitch has no plan children.

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 | ASTIdentifier[] | IdSet

Returns

boolean

Inherited from

PlanTupleOperator.removeFromSchema

---

replaceChild()

replaceChild(current, replacement): void

Defined in: lang-sql/src/plan/langswitch.ts:46

Not supported - a LangSwitch has no plan children.

Parameters

Parameter	Type
current	PlanTupleOperator
replacement	PlanTupleOperator

Returns

void

Throws

Always throws; replace the operator itself rather than its children.

Overrides

PlanTupleOperator.replaceChild