Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/10697#discussion_r52695492 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/CountVectorizer.scala --- @@ -71,7 +71,8 @@ private[feature] trait CountVectorizerParams extends Params with HasInputCol wit /** Validates and transforms the input schema. */ protected def validateAndTransformSchema(schema: StructType): StructType = { validateParams() - SchemaUtils.checkColumnType(schema, $(inputCol), new ArrayType(StringType, true)) + val typeCandidates = List(new ArrayType(StringType, true), new ArrayType(StringType, false)) --- End diff -- minor: `new` is not necessary since `ArrayType` is a case class
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