spark技术分享NamedExpression Contract — Catalyst Expressions with Name, ID and Qualifier
NamedExpression is a contract of Catalyst expressions that have a name, exprId, and optional qualifier.
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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 } |
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