Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/17170
To clarify with your example, with ALS we have userCol, ratingCol - these
matches the API names in spark.ml, and I think we need to do the same here.
What don't you like about [`featuresCol` which is also in the Scala
API](https://github.com/apache/spark/blob/0fe8020f3aaf61c9992b6bcc5dba7ae8f751bab7/mllib/src/main/scala/org/apache/spark/ml/fpm/FPGrowth.scala#L201)?
`featuresCol` is really a standard trait with `HasFeaturesCol` used in
different ml model across Spark.
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