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join Operator — Streaming Join

join(
  right: Dataset[_]): DataFrame
join(
  right: Dataset[_],
  joinExprs: Column): DataFrame
join(
  right: Dataset[_],
  joinExprs: Column,
  joinType: String): DataFrame
join(
  right: Dataset[_],
  usingColumns: Seq[String]): DataFrame
join(
  right: Dataset[_],
  usingColumns: Seq[String],
  joinType: String): DataFrame
join(
  right: Dataset[_],
  usingColumn: String): DataFrame

Streaming Join