Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19244#discussion_r139281714
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/GenFuncTransformer.scala ---
@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.ml.feature
+
+import scala.util.Random
+
+import org.apache.spark.annotation.Since
+import org.apache.spark.ml.Transformer
+import org.apache.spark.ml.param.Param
+import org.apache.spark.ml.param.ParamMap
+import org.apache.spark.ml.param.shared.HasInputCols
+import org.apache.spark.ml.param.shared.HasOutputCol
+import org.apache.spark.ml.util.DefaultParamsReadable
+import org.apache.spark.ml.util.DefaultParamsWritable
+import org.apache.spark.ml.util.Identifiable
+import org.apache.spark.sql.DataFrame
+import org.apache.spark.sql.Dataset
+import org.apache.spark.sql.Row
+import org.apache.spark.sql.catalyst.encoders.RowEncoder
+import org.apache.spark.sql.types.DoubleType
+import org.apache.spark.sql.types.NumericType
+import org.apache.spark.sql.types.StructField
+import org.apache.spark.sql.types.StructType
+
+import javax.script.ScriptEngineManager
--- End diff --
I think introducing Javascript is a non-starter
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