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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/06/07 18:39:21 UTC
[jira] [Assigned] (SPARK-15807) Support varargs for
distinct/dropDuplicates in Dataset/DataFrame
[ https://issues.apache.org/jira/browse/SPARK-15807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-15807:
------------------------------------
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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