GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/7305
[SPARK-8930][SQL] Support a star '*' in generator function arguments
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)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark UnresolvedStartIssueInGenerate
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/7305.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #7305
----
commit 70fdd4139a16fc964de19f54884340089f61d95b
Author: Takeshi YAMAMURO <[email protected]>
Date: 2015-07-09T00:35:54Z
Fix a bug that throws an exception when Generator contains a UnresolvedStar
----
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