case class CaseColumnElseColumn[A, B](column: Column[B], mappings: List[(Column[_], Column[A])], else: Column[A])(implicit columnType: ColumnType[A]) extends CaseColumn[A] with Product with Serializable
A case statement that compares a column to multiple values e.g.
case position when 1 then 'Gold' when 2 then 'Silver' when 3 then 'Bronze' else 'Other' end
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