zhengruifeng commented on PR #49648:
URL: https://github.com/apache/spark/pull/49648#issuecomment-2612078082
```
from pyspark.ml.feature import *
df = spark.createDataFrame(
[
(0, 3, 5.0, 0.0),
(1, 4, 5.0, 1.0),
(2, 3, 5.0, 0.0),
(0, 4, 6.0, 1.0),
(1, 3, 6.0, 0.0),
(2, 4, 6.0, 1.0),
(0, 3, 7.0, 0.0),
(1, 4, 8.0, 1.0),
(2, 3, 9.0, 0.0),
],
schema="input1 short, input2 int, input3 double, label double",
)
encoder = TargetEncoder(
inputCols=["input1", "input2", "input3"],
outputCols=["output", "output2", "output3"],
labelCol="label",
targetType="binary",
)
model = encoder.fit(df)
model.write().overwrite().save("/tmp/ta")
TargetEncoderModel.load("/tmp/ta")
```
fails with
```
java.lang.NullPointerException
at
org.apache.spark.connect.proto.FetchErrorDetailsResponse$Error$Builder.setMessage(FetchErrorDetailsResponse.java:5654)
at
org.apache.spark.sql.connect.utils.ErrorUtils$.throwableToFetchErrorDetailsResponse(ErrorUtils.scala:89)
at
org.apache.spark.sql.connect.service.SparkConnectFetchErrorDetailsHandler.$anonfun$handle$1(SparkConnectFetchErrorDetailsHandler.scala:51)
at scala.Option.map(Option.scala:242)
at
org.apache.spark.sql.connect.service.SparkConnectFetchErrorDetailsHandler.handle(SparkConnectFetchErrorDetailsHandler.scala:44)
at
org.apache.spark.sql.connect.service.SparkConnectService.fetchErrorDetails(SparkConnectService.scala:224)
at
org.apache.spark.connect.proto.SparkConnectServiceGrpc$MethodHandlers.invoke(SparkConnectServiceGrpc.java:935)
at
org.sparkproject.connect.grpc.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:182)
at
org.sparkproject.connect.grpc.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:356)
at
org.sparkproject.connect.grpc.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:861)
at
org.sparkproject.connect.grpc.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at
org.sparkproject.connect.grpc.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)
```
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