[jira] [Created] (SPARK-17866) Dataset.dropDuplicates (i.e., distinct) should not change the output of child plan

["Liang-Chi Hsieh (JIRA)" <ji...@apache.org>]

Liang-Chi Hsieh created SPARK-17866:
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             Summary: Dataset.dropDuplicates (i.e., distinct) should not change the output of child plan
                 Key: SPARK-17866
                 URL: https://issues.apache.org/jira/browse/SPARK-17866
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Liang-Chi Hsieh


We create new Alias with new exprId in Dataset.dropDuplicates now. However it causes problem when we want to select the columns as follows:

{code}
val ds = Seq(("a", 1), ("a", 2), ("b", 1), ("a", 1)).toDS()
// ds("_2") will cause analysis exception
ds.dropDuplicates("_1").select(ds("_1").as[String], ds("_2").as[Int])
{code}



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