scala.MatchError: BooleanType when casting a struct

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:

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$)

A workaround is to temporarily cast the field to an Integer and back:

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