合并spark java dataframe中的列

import org.apache.spark.sql.SparkSession;

SparkSession spark = SparkSession
    .builder()
    .appName("Merge Columns in Spark DataFrame")
    .getOrCreate();

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

String filePath = "path/to/csv/file.csv";
StructType schema = new StructType()
    .add("column1", "string")
    .add("column2", "string");
Dataset<Row> df = spark.read()
    .format("csv")
    .option("header", true)
    .schema(schema)
    .load(filePath);

import org.apache.spark.sql.functions;

Dataset<Row> mergedDF = df.withColumn("mergedColumn", functions.concat(df.col("column1"), df.col("column2")));

mergedDF.select("column1", "column2", "mergedColumn").show();