Xiao Li created SPARK-21350:
-------------------------------
Summary: 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: 2.1.1, 2.0.2, 2.2.0
Reporter: Xiao Li
Assignee: Xiao Li
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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