class AutoGeneratedAliasProvider extends AnyRef
AutoGeneratedAliasProvider is a tool to create auto-generated aliases in the plan. All the auto-generated aliases have to be registered in ExpressionIdAssigner.
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- new AutoGeneratedAliasProvider(expressionIdAssigner: ExpressionIdAssigner)
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- def newAlias(child: Expression, name: Option[String] = None, explicitMetadata: Option[Metadata] = None): Alias
Create a new auto-generated Alias.
Create a new auto-generated Alias. If the
nameis not provided, toPrettySql is going to be used to generate a proper alias name. We call ExpressionIdAssigner.mapExpression to register this alias in the ExpressionIdAssigner. - def newAliasImpl(child: Expression, name: Option[String] = None, explicitMetadata: Option[Metadata] = None, skipExpressionIdAssigner: Boolean = false): Alias
- def newOuterAlias(child: Expression, name: Option[String] = None, explicitMetadata: Option[Metadata] = None): Alias
Create a new auto-generated Alias.
Create a new auto-generated Alias. If the
nameis not provided, toPrettySql is going to be used to generate a proper alias name. We don't call ExpressionIdAssigner.mapExpression for outer aliases, because thy should be manually mapped in the context of an outer query. - final def notify(): Unit
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(Since version 9)