Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21804#discussion_r203947449
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/FeatureHasher.scala ---
@@ -208,8 +208,9 @@ class FeatureHasher(@Since("2.3.0") override val uid:
String) extends Transforme
require(dataType.isInstanceOf[NumericType] ||
dataType.isInstanceOf[StringType] ||
dataType.isInstanceOf[BooleanType],
- s"FeatureHasher requires columns to be of NumericType, BooleanType
or StringType. " +
- s"Column $fieldName was $dataType")
+ s"FeatureHasher requires columns to be of
${NumericType.simpleString}, " +
--- End diff --
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