返回空值的PySpark DateTime函数

from pyspark.sql import SparkSession
from pyspark.sql.functions import col, isNull, coalesce

# 创建SparkSession
spark = SparkSession.builder.getOrCreate()

# 创建示例数据集
data = [("2022-01-01", "10:30:00"), ("2022-01-02", None), (None, "12:00:00")]
df = spark.createDataFrame(data, ["date", "time"])

# 检查某列是否为空
df.select(isNull(col("date"))).show()

# 替换空值
df.select(coalesce(col("date"), "N/A"), coalesce(col("time"), "N/A")).show()