Mithun Radhakrishnan created SPARK-48995:
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Summary: Column.endswith(None) occasionally causes NPE
Key: SPARK-48995
URL: https://issues.apache.org/jira/browse/SPARK-48995
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 4.0.0
Environment: Tested from {{pyspark}} shell, on Apache Spark 4.0.
Reporter: Mithun Radhakrishnan
This one is pretty hard to repro, since it only seems to happen occasionally.
Invoking `Column.endswith()` seems to result in an NPE, with Spark 4.0:
{code:python}
from pyspark.sql.types import *
import pyspark.sql.functions as f
schema = StructType([StructField("s", StringType(), True)])
strings = [Row("abc"), Row("bcd"), Row(None)]
df = sc.parallelize(strings).toDF(schema)
df.select( f.col('s').endswith(None) ).collect()
{code}
Here is the resulting stack trace:
{code}
py4j.protocol.Py4JJavaError: An error occurred while calling o205.endsWith.
: java.lang.NullPointerException: Cannot invoke
"org.apache.spark.sql.Column.expr()" because "x$1" is null
at org.apache.spark.sql.Column$.$anonfun$fn$2(Column.scala:77)
at scala.collection.immutable.ArraySeq.map(ArraySeq.scala:75)
at scala.collection.immutable.ArraySeq.map(ArraySeq.scala:35)
at org.apache.spark.sql.Column$.$anonfun$fn$1(Column.scala:77)
at
org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(origin.scala:84)
at org.apache.spark.sql.package$.withOrigin(package.scala:111)
at org.apache.spark.sql.Column$.fn(Column.scala:76)
at org.apache.spark.sql.Column$.fn(Column.scala:64)
at org.apache.spark.sql.Column.fn(Column.scala:169)
at org.apache.spark.sql.Column.endsWith(Column.scala:1078)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:374)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at
py4j.ClientServerConnection.waitForCommands(ClientServerConnection.java:182)
at py4j.ClientServerConnection.run(ClientServerConnection.java:106)
at java.base/java.lang.Thread.run(Thread.java:840)
{code}
This seems to point to {{Column::fn}}, which looks new to Spark 4.0.
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