org.apache.spark.SparkException:未能执行用户定义的函数
问题描述:
我新来斯卡拉,我想执行以下代码:org.apache.spark.SparkException:未能执行用户定义的函数
val SetID = udf{(c:String, d: String) =>
if(c.UpperCase.contains("EXKLUS") == true)
{d}
else {""}
}
val ParquetWithID = STG1
.withColumn("ID", SetID(col("line_item"), col("line_item_ID")))
两列(line_item
和line_item_id
)被定义为Strings
在STG1
架构。
我收到以下错误,当我尝试运行代码:
`org.apache.spark.SparkException: Failed to execute user defined function($anonfun$1$$anonfun$2: (string, string) => string)
at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown Source)
at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
at org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:370)
at org.apache.spark.sql.execution.SparkPlan$$anonfun$4.apply(SparkPlan.scala:246)
at org.apache.spark.sql.execution.SparkPlan$$anonfun$4.apply(SparkPlan.scala:240)
at org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$24.apply(RDD.scala:803)
at org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$24.apply(RDD.scala:803)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:70)
at org.apache.spark.scheduler.Task.run(Task.scala:86)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
和
Caused by: java.lang.NullPointerException
at MyTests$$anonfun$1$$anonfun$2.apply(MyTests.scala:356)
at MyTests$$anonfun$1$$anonfun$2.apply(MyTests.scala:355)
... 16 more
我也试过c.UpperCase().contains("EXKLUS")
,但我得到了同样的错误。 但是,如果我只是运行“if equals
”声明一切正常。所以我想这个问题是在我的udf
中使用UpperCase().contains(" ")
函数,但我不明白问题来自哪里。任何帮助将appriciated!
答
如果schema
包含作为
|-- line_item: string (nullable = true)
|-- line_item_ID: string (nullable = true)
然后在您的null
检查if语句就可以解决这个问题,因为(注意,字符串toUpperCase
法)
val SetID = udf{(c:String, d: String) =>
if(c != null && c.toUpperCase.contains("EXKLUS") == true)
{d}
else {""}
}
val ParquetWithID = STG1
.withColumn("ID", SetID(col("line_item"), col("line_item_ID")))
我希望答案有帮助
这工作!谢谢! – Inna
很高兴听到@Inna和感谢接受:) –