Cheng Lian created SPARK-13556:
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             Summary: Migrate untyped joins
                 Key: SPARK-13556
                 URL: https://issues.apache.org/jira/browse/SPARK-13556
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Cheng Lian
            Assignee: Cheng Lian


Should migrate the following methods and corresponding tests to Dataset:

{noformat}
- Joins

  - Untyped joins

    - join[U: Encoder](Dataset[U]): Dataset[Row]
    - join[U: Encoder](Dataset[U], String): Dataset[Row]
    - join[U: Encoder](Dataset[U], Seq[String]): Dataset[Row]
    - join[U: Encoder](Dataset[U], Seq[String], String): Dataset[Row]
    - join[U: Encoder](Dataset[U], Column): Dataset[Row]
    - join[U: Encoder](Dataset[U], Column, String): Dataset[Row]
{noformat}




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