Github user yogeshg commented on a diff in the pull request:
https://github.com/apache/spark/pull/20829#discussion_r176245770
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/feature/VectorAssemblerSuite.scala ---
@@ -147,4 +149,72 @@ class VectorAssemblerSuite
.filter(vectorUDF($"features") > 1)
.count() == 1)
}
+
+ test("assemble should keep nulls") {
+ import org.apache.spark.ml.feature.VectorAssembler.assemble
+ assert(assemble(Seq(1, 1), true)(1.0, null) === Vectors.dense(1.0,
Double.NaN))
+ assert(assemble(Seq(1, 2), true)(1.0, null) === Vectors.dense(1.0,
Double.NaN, Double.NaN))
+ assert(assemble(Seq(1), true)(null) === Vectors.dense(Double.NaN))
+ assert(assemble(Seq(2), true)(null) === Vectors.dense(Double.NaN,
Double.NaN))
+ }
+
+ test("assemble should throw errors") {
+ import org.apache.spark.ml.feature.VectorAssembler.assemble
+ intercept[SparkException](assemble(Seq(1, 1), false)(1.0, null) ===
+ Vectors.dense(1.0, Double.NaN))
+ intercept[SparkException](assemble(Seq(1, 2), false)(1.0, null) ===
+ Vectors.dense(1.0, Double.NaN, Double.NaN))
+ intercept[SparkException](assemble(Seq(1), false)(null) ===
Vectors.dense(Double.NaN))
+ intercept[SparkException](assemble(Seq(2), false)(null) ===
+ Vectors.dense(Double.NaN, Double.NaN))
+ }
+
+ test("get lengths function") {
--- End diff --
Thanks! We do throw some descriptive error
[here](https://github.com/apache/spark/pull/20829/files#diff-9c84e1d27f25714e256cb482069359cfR193),
added more description to it and made assertions in test on those messages.
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