[Question] Don't know how to save StructField

[97dawn]

Hello.
When I tried reading data from parquet files and save data to Redshift using spark-redshift_2.11-2.0.0,
I got this error.

pyspark.sql.utils.IllegalArgumentException: "Don't know how to save StructField(a,StructType(StructField(b,StringType,true),StructField(b,StructType(StructField(x,LongType,true), StructField(y,LongType,true), StructField(z,LongType,true)),true),true) to JDBC"

How can I deal with StructType in spark-redshift?