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https://issues.apache.org/jira/browse/SPARK-15807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-15807:
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Assignee: (was: Apache Spark)
> Support varargs for distinct/dropDuplicates in Dataset/DataFrame
> ----------------------------------------------------------------
>
> Key: SPARK-15807
> URL: https://issues.apache.org/jira/browse/SPARK-15807
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Dongjoon Hyun
>
> This issue adds `varargs`-types `distinct/dropDuplicates` functions in
> `Dataset/DataFrame`. Currently, `distinct` does not get arguments, and
> `dropDuplicates` supports only `Seq` or `Array`.
> {code}
> scala> val ds = spark.createDataFrame(Seq(("a", 1), ("b", 2), ("a", 2)))
> ds: org.apache.spark.sql.DataFrame = [_1: string, _2: int]
> scala> ds.dropDuplicates(Seq("_1", "_2"))
> res0: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [_1: string,
> _2: int]
> scala> ds.dropDuplicates("_1", "_2")
> <console>:26: error: overloaded method value dropDuplicates with alternatives:
> (colNames:
> Array[String])org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] <and>
> (colNames:
> Seq[String])org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] <and>
> ()org.apache.spark.sql.Dataset[org.apache.spark.sql.Row]
> cannot be applied to (String, String)
> ds.dropDuplicates("_1", "_2")
> ^
> scala> ds.distinct("_1", "_2")
> <console>:26: error: too many arguments for method distinct:
> ()org.apache.spark.sql.Dataset[org.apache.spark.sql.Row]
> ds.distinct("_1", "_2")
> {code}
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