Github user holdenk commented on a diff in the pull request: https://github.com/apache/spark/pull/19876#discussion_r158114844 --- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala --- @@ -126,15 +180,69 @@ abstract class MLWriter extends BaseReadWrite with Logging { this } + // override for Java compatibility + override def session(sparkSession: SparkSession): this.type = super.session(sparkSession) + + // override for Java compatibility + override def context(sqlContext: SQLContext): this.type = super.session(sqlContext.sparkSession) +} + +/** + * A ML Writer which delegates based on the requested format. + */ +class GeneralMLWriter(stage: PipelineStage) extends MLWriter with Logging { --- End diff -- So I don't think that belongs in the base GeneralMLWriter, but we could make a trait for writers which support PMML to mix in?
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