[
https://issues.apache.org/jira/browse/SPARK-21350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Wenchen Fan resolved SPARK-21350.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 18574
[https://github.com/apache/spark/pull/18574]
> Fix the error message when the number of arguments is wrong when invoking a
> UDF
> -------------------------------------------------------------------------------
>
> Key: SPARK-21350
> URL: https://issues.apache.org/jira/browse/SPARK-21350
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.2, 2.1.1, 2.2.0
> Reporter: Xiao Li
> Assignee: Xiao Li
> Fix For: 2.3.0
>
>
> Got a confusing error message when the number of arguments is wrong when
> invoking a UDF.
> {noformat}
> val df = spark.emptyDataFrame
> spark.udf.register("foo", (_: String).length)
> df.selectExpr("foo(2, 3, 4)")
> {noformat}
> {noformat}
> org.apache.spark.sql.UDFSuite$$anonfun$9$$anonfun$apply$mcV$sp$12 cannot be
> cast to scala.Function3
> java.lang.ClassCastException:
> org.apache.spark.sql.UDFSuite$$anonfun$9$$anonfun$apply$mcV$sp$12 cannot be
> cast to scala.Function3
> at
> org.apache.spark.sql.catalyst.expressions.ScalaUDF.<init>(ScalaUDF.scala:109)
> {noformat}
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