If I wanted to create a StructType
(i.e. a DataFrame.schema
) out of a case class
, is there a way to do it without creating a DataFrame
? I can easily do:
case class TestCase(id: Long)
val schema = Seq[TestCase]().toDF.schema
But it seems overkill to actually create a DataFrame
when all I want is the schema.
(If you are curious, the reason behind the question is that I am defining a UserDefinedAggregateFunction
, and to do so you override a couple of methods that return StructTypes
and I use case classes.)
See Question&Answers more detail:
os 与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…