scala - 来自 SchemaRDD 的模式？

Question

给定一个SchemaRDD（使用加载SQLContext.parquetFile），我如何提取它的元数据/模式/列列表？

Answer 1

The field list is accessible through the SchemaRDD as [rdd].schema.fields.

lazy val schema: StructType
         Returns the schema of this SchemaRDD (represented by a StructType).

Answer 2

下还有一个printSchema()方法SchemaRDD，见SchemaRDD。