创建空的dataframe Java Spark

import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;
import org.apache.spark.sql.types.StructType;

SparkSession spark = SparkSession.builder()
        .appName("Empty DataFrame Example")
        .config("spark.some.config.option", "some-value")
        .getOrCreate();

StructType schema = new StructType();

Dataset<Row> emptyDF = spark.createDataFrame(spark.emptyDataFrame(), schema);