trait AliasHelper extends AnyRef
Helper methods for collecting and replacing aliases.
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- def getAliasMap(exprs: Seq[NamedExpression]): AttributeMap[Alias]
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- def getAliasMap(plan: Aggregate): AttributeMap[Alias]
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- def getAliasMap(plan: Project): AttributeMap[Alias]
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- def replaceAlias(expr: Expression, aliasMap: AttributeMap[Alias]): Expression
Replace all attributes, that reference an alias, with the aliased expression
Replace all attributes, that reference an alias, with the aliased expression
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- def replaceAliasButKeepName(expr: NamedExpression, aliasMap: AttributeMap[Alias]): NamedExpression
Replace all attributes, that reference an alias, with the aliased expression, but keep the name of the outermost attribute.
Replace all attributes, that reference an alias, with the aliased expression, but keep the name of the outermost attribute.
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- def trimAliases(e: Expression): Expression
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- def trimNonTopLevelAliases[T <: Expression](e: T): T
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