case class KeepFirstWithinPartition(partitionByExpr: Seq[String], orderByExpr: Column*) extends Transformation with Product with Serializable
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(Since version 0.2.0) use DropDuplicates instead
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def
->(t: Transformation): Transformation
Combines two transformations into one and execute the transformation on the left side of the arrow first.
Combines two transformations into one and execute the transformation on the left side of the arrow first.
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transformation to combine with
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a new instance of Transformation
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- val orderByExpr: Column*
- val partitionByExpr: Seq[String]
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def
transform: (DataFrame) ⇒ DataFrame
Main method of the trait.
Main method of the trait. It defines the logic to transform the input dataframe.
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a transformed dataframe
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