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pyspark max of two columns

Talented Tarsier on Apr 14, 2021

from pyspark.sql.types import *

schema = StructType([
    StructField("ClientId", IntegerType(), True),
    StructField("m_ant21", IntegerType(), True),
    StructField("m_ant22", IntegerType(), True),
    StructField("m_ant23", IntegerType(), True),
    StructField("m_ant24", IntegerType(), True)
])

df = spark\
    .createDataFrame(
        data=[(0, None, None, None, None),
             (1, 23, 13, 17, 99),
             (2, 0, 0, 0, 1),
             (3, 0, None, 1, 0)],
        schema=schema)

import pyspark.sql.functions as F

def agg_to_list(m21,m22,m23,m24):
    return [m21,m22,m23,m24]

u_agg_to_list = F.udf(agg_to_list, ArrayType(IntegerType()))

df2 = df.withColumn('all_values', u_agg_to_list('m_ant21', 'm_ant22', 'm_ant23', 'm_ant24'))\
        .withColumn('max', F.sort_array("all_values", False)[0])\
        .select('ClientId', 'max')

df2.show()

Source: stackoverflow.com

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"pyspark max of two columns" Code Answer's