NamedExpression¶

NamedExpression is an extension of the Expression abstraction for named expressions (with an ExprId and an optional qualifier).

Contract¶

ExprId¶

exprId: ExprId

Name¶

name: String

Creating NamedExpression¶

newInstance(): NamedExpression

Qualifier (Parts)¶

qualifier: Seq[String]

Optional qualifier parts (with the names of catalog, database, table, fields, incl. nested fields)

Converting to Attribute¶

toAttribute: Attribute

Implementations¶

• Attribute
• others

foldable¶

foldable: Boolean

foldable is part of the Expression abstraction.

foldable is always false (in order to not remove the alias).