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https://issues.apache.org/jira/browse/SPARK-17809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-17809.
--------------------------------
Resolution: Fixed
Fix Version/s: 2.0.1
> scala.MatchError: BooleanType when casting a struct
> ---------------------------------------------------
>
> Key: SPARK-17809
> URL: https://issues.apache.org/jira/browse/SPARK-17809
> Project: Spark
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Niek Bartholomeus
> Fix For: 2.0.1
>
>
> I have a Dataframe with a struct and I need to rename some fields to lower
> case before saving it to cassandra.
> It turns out that it's not possible to cast a boolean field of a struct to
> another boolean field in the renamed struct:
> {quote}
> case class ClassWithBoolean(flag: Boolean)
> case class Parent(cwb: ClassWithBoolean)
> val structCwb: DataType = StructType(Seq(
> StructField("flag", BooleanType, true)
> ))
> Seq(Parent(ClassWithBoolean(true)))
> .toDF
> .withColumn("cwb", $"cwb".cast(structCwb))
> .collect
> scala.MatchError: BooleanType (of class
> org.apache.spark.sql.types.BooleanType$)
> {quote}
> A workaround is to temporarily cast the field to an Integer and back:
> {quote}
> val structCwbTmp: DataType = StructType(Seq(
> StructField("flag", IntegerType, true)
> ))
> Seq(Parent(ClassWithBoolean(true)))
> .toDF
> .withColumn("cwb", $"cwb".cast(structCwbTmp))
> .withColumn("cwb", $"cwb".cast(structCwb))
> .collect
> {quote}
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