在pyspark中使用窗口函数计算日期差异可以通过以下步骤实现:
from pyspark.sql import SparkSession
from pyspark.sql.functions import col, datediff, lag
from pyspark.sql.window import Window
spark = SparkSession.builder.appName("WindowFunctionExample").getOrCreate()
data = [("2022-01-01", 1), ("2022-01-03", 2), ("2022-01-06", 3), ("2022-01-10", 4)]
df = spark.createDataFrame(data, ["date", "value"])
df = df.withColumn("date", col("date").cast("date"))
windowSpec = Window.orderBy("date")
df = df.withColumn("date_diff", datediff(col("date"), lag(col("date")).over(windowSpec)))
在上述代码中,lag(col("date")).over(windowSpec)
用于获取前一行的日期值,datediff(col("date"), lag(col("date")).over(windowSpec))
用于计算当前行日期与前一行日期的差异。
df.show()
完整代码示例:
from pyspark.sql import SparkSession
from pyspark.sql.functions import col, datediff, lag
from pyspark.sql.window import Window
spark = SparkSession.builder.appName("WindowFunctionExample").getOrCreate()
data = [("2022-01-01", 1), ("2022-01-03", 2), ("2022-01-06", 3), ("2022-01-10", 4)]
df = spark.createDataFrame(data, ["date", "value"])
df = df.withColumn("date", col("date").cast("date"))
windowSpec = Window.orderBy("date")
df = df.withColumn("date_diff", datediff(col("date"), lag(col("date")).over(windowSpec)))
df.show()
这样,你就可以使用窗口函数计算pyspark中的日期差异了。
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