NamedExpression Contract — Catalyst Expressions with Name, ID and Qualifier

NamedExpression is a contract of Catalyst expressions that have a name, exprId, and optional qualifier.

package org.apache.spark.sql.catalyst.expressions

trait NamedExpression extends Expression {
  // only required methods that have no implementation
  def exprId: ExprId
  def name: String
  def newInstance(): NamedExpression
  def qualifier: Option[String]
  def toAttribute: Attribute
}
Table 1. NamedExpression Contract
Method Description

exprId

Used when…​FIXME

name

Used when…​FIXME

qualifier

Used when…​FIXME

toAttribute

Creating ExprId — newExprId Object Method

newExprId: ExprId

newExprId…​FIXME

Note
 newExprId is used when…​FIXME

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