[jira] [Created] (SPARK-8930) Support a star '*' in the generator function argument

["Takeshi Yamamuro (JIRA)" <ji...@apache.org>]

Takeshi Yamamuro created SPARK-8930:
---------------------------------------

             Summary: Support a star '*' in the generator function argument
                 Key: SPARK-8930
                 URL: https://issues.apache.org/jira/browse/SPARK-8930
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.4.0
            Reporter: Takeshi Yamamuro


The current implementation throws an exception if generators contain a star '*' like codes blow;

    val df = Seq(("1", "1,2"), ("2", "4"), ("3", "7,8,9")).toDF("prefix", "csv")
    checkAnswer(
      df.explode($"*") { case Row(prefix: String, csv: String) =>
        csv.split(",").map(v => Tuple1(prefix + ":" + v))
      },
      Row("1", "1,2", "1:1") :: Row("1", "1,2", "1:2")
        :: Row("2", "4", "2:4")
        :: Row("3", "7,8,9", "3:7") :: Row("3", "7,8,9", "3:8") :: Row("3", "7,8,9", "3:9")
        :: Nil
    )

[info] - explode takes UnresolvedStar *** FAILED *** (14 milliseconds)
[info]   org.apache.spark.sql.AnalysisException: cannot resolve '_1' given input columns prefix, csv;
[info]   at org.apache.spark.sql.catalyst.analysis.package$AnalysisErrorAt.failAnalysis(package.scala:42)
[info]   at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:55)
[info]   at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:52)
[info]   at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$1.apply(TreeNode.scala:291)
[info]   at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$1.apply(TreeNode.scala:291)
[info]   at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:51)
[info]   at org.apache.spark.sql.catalyst.trees.TreeNode.transformUp(TreeNode.scala:290)
[info]   at org.apache.spark.sql.catalyst.plans.QueryPlan.transformExpressionUp$1(QueryPlan.scala:107)
[info]   at org.apache.spark.sql.catalyst.plans.QueryPlan.org$apache$spark$sql$catalyst$plans$QueryPlan$$recursiveTransform$2(QueryPlan.scala:117)
[info]   at org.apache.spark.sql.catalyst.plans.QueryPlan$$anonfun$org$apache$spark$sql$catalyst$plans$QueryPlan$$recursiveTransform$2$1.apply(QueryPlan.scala:1
21)
[info]   at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
[info]   at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
[info]   at scala.collection.immutable.List.foreach(List.scala:318)
[info]   at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
[info]   at scala.collection.AbstractTraversable.map(Traversable.scala:105)



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