zhengruifeng commented on code in PR #44526:
URL: https://github.com/apache/spark/pull/44526#discussion_r1437621074
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mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala:
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@@ -324,13 +324,22 @@ class ALSModel private[ml] (
// create a new column named map(predictionCol) by running the predict UDF.
val validatedUsers = checkIntegers(dataset, $(userCol))
val validatedItems = checkIntegers(dataset, $(itemCol))
+
+ val validatedInputAlias = Identifiable.randomUID("__als_validated_input")
+ val itemFactorsAlias = Identifiable.randomUID("__als_item_factors")
+ val userFactorsAlias = Identifiable.randomUID("__als_user_factors")
+
val predictions = dataset
- .join(userFactors,
- validatedUsers === userFactors("id"), "left")
- .join(itemFactors,
- validatedItems === itemFactors("id"), "left")
- .select(dataset("*"),
- predict(userFactors("features"),
itemFactors("features")).as($(predictionCol)))
+ .withColumns(Map($(userCol) -> validatedUsers, $(itemCol) ->
validatedItems))
Review Comment:
It maybe not needed, I want to use `withColumns` to validate the columns
first (while keep the column name) and then reference the validated column by
`s"${validatedInputAlias}.${$(itemCol)}"`
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