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 --
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