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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/09/14 20:17:45 UTC
[jira] [Assigned] (SPARK-10573) IndexToString transformSchema adds
output field as DoubleType
[ https://issues.apache.org/jira/browse/SPARK-10573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-10573:
------------------------------------
Assignee: Apache Spark
> IndexToString transformSchema adds output field as DoubleType
> -------------------------------------------------------------
>
> Key: SPARK-10573
> URL: https://issues.apache.org/jira/browse/SPARK-10573
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 1.5.0
> Reporter: Nick Pritchard
> Assignee: Apache Spark
>
> Reproducible example:
> {code}
> val stage = new IndexToString().setInputCol("input").setOutputCol("output")
> val inSchema = StructType(Seq(StructField("input", DoubleType)))
> val outSchema = stage.transformSchema(inSchema)
> assert(outSchema("output").dataType == StringType)
> {code}
> The root cause seems to be that it uses {{NominalAttribute.toStructField}} which assumes {{DoubleType}}. It would probably be better to just use {{SchemaUtils.appendColumn}} and explicitly set the data type.
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