zhengruifeng commented on a change in pull request #31472:
URL: https://github.com/apache/spark/pull/31472#discussion_r570744185
##########
File path:
mllib/src/main/scala/org/apache/spark/ml/classification/OneVsRest.scala
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@@ -185,71 +185,56 @@ final class OneVsRestModel private[ml] (
return dataset.toDF
}
- // determine the input columns: these need to be passed through
- val origCols = dataset.schema.map(f => col(f.name))
-
// add an accumulator column to store predictions of all the models
val accColName = "mbc$acc" + UUID.randomUUID().toString
- val initUDF = udf { () => Map[Int, Double]() }
- val newDataset = dataset.withColumn(accColName, initUDF())
+ val newDataset = dataset.withColumn(accColName,
lit(Array.emptyDoubleArray))
// persist if underlying dataset is not persistent.
val handlePersistence = !dataset.isStreaming && dataset.storageLevel ==
StorageLevel.NONE
- if (handlePersistence) {
- newDataset.persist(StorageLevel.MEMORY_AND_DISK)
- }
+ if (handlePersistence) newDataset.persist(StorageLevel.MEMORY_AND_DISK)
Review comment:
ok, I will ignore similar case in the future.
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