Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/21804#discussion_r203947486 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala --- @@ -104,7 +104,7 @@ class HashingTF @Since("1.4.0") (@Since("1.4.0") override val uid: String) override def transformSchema(schema: StructType): StructType = { val inputType = schema($(inputCol)).dataType require(inputType.isInstanceOf[ArrayType], - s"The input column must be ArrayType, but got $inputType.") + s"The input column must be ${ArrayType.simpleString}, but got ${inputType.catalogString}.") --- End diff -- let us change all?
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