object WatermarkSupport extends Serializable
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- def findEventTimeColumn(attrs: Seq[Attribute], allowMultipleEventTimeColumns: Boolean): Option[Attribute]
Find the column which is marked as "event time" column.
Find the column which is marked as "event time" column.
If there are multiple event time columns in given column list, the behavior depends on the parameter
allowMultipleEventTimeColumns. If it's set to true, the first occurred column will be returned. If not, this method will throw an AnalysisException as it is not allowed to have multiple event time columns. - final def getClass(): Class[_ <: AnyRef]
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- def watermarkExpression(optionalWatermarkExpression: Option[Expression], optionalWatermarkMs: Option[Long]): Option[Expression]
Generate an expression on given attributes that matches data older than the watermark
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- Deprecated
(Since version 9)