如何逐行执行两个pyspark数据帧的乘法

from pyspark.sql import SparkSession
from pyspark.sql.functions import col

spark = SparkSession.builder.getOrCreate()

df1 = spark.createDataFrame([(1, 2), (3, 4)], ["col1", "col2"])
df2 = spark.createDataFrame([(5, 6), (7, 8)], ["col3", "col4"])

result = df1.join(df2, col("col1") == col("col3"), "inner")

result = result.withColumn("multiply", col("col2") * col("col4"))

result.show()