如何检查手头的值是否在某些 PySpark 数据帧的特定列中? [英] How to check if the value at hand is in a particular column of some PySpark dataframe?

问题描述

我有一个 PySpark 数据帧 trips，我正在其上执行聚合.对于每个PULocationID，我首先计算total_amount的平均值，然后是行程数，最后是DOLocationID 位于 mtrips 的 DOLocationID 列中，另一个 PySpark 数据帧.

I have a PySpark dataframe, trips, on which I am performing aggregations. For each PULocationID, I am first computing the average of total_amount, then the number of trips, and finally, the number of trips whose DOLocationID is in the DOLocationID column of mtrips, another PySpark dataframe.

我在下面包含了 trips 和 mtrips 的模式.

I'm including the schemas for both trips and mtrips below.

我目前的代码如下但不完整:

My current code is as follows but it is incomplete:

import pyspark.sql.functions as F
cnt_cond = lambda cond: F.sum(F.when(cond, 1).otherwise(0))
(
    trips
        .groupBy('PULocationID', 'DOLocationID')
        .agg(
            F.mean('total_amount').alias('avg_total_amt'),
            F.count('*').alias('trip_count'),
            cnt_cond(mtrips.DOLocationID.contains(trips.DOLocationID)).alias('trips_to_pop')
        )
        .show(200)
)

trips.printSchema()

# root
#  |-- VendorID: integer (nullable = true)
#  |-- tpep_pickup_datetime: timestamp (nullable = true)
#  |-- tpep_dropoff_datetime: timestamp (nullable = true)
#  |-- passenger_count: integer (nullable = true)
#  |-- trip_distance: double (nullable = true)
#  |-- RatecodeID: integer (nullable = true)
#  |-- store_and_fwd_flag: string (nullable = true)
#  |-- PULocationID: integer (nullable = true)
#  |-- DOLocationID: integer (nullable = true)
#  |-- payment_type: integer (nullable = true)
#  |-- fare_amount: double (nullable = true)
#  |-- extra: double (nullable = true)
#  |-- mta_tax: double (nullable = true)
#  |-- tip_amount: double (nullable = true)
#  |-- tolls_amount: double (nullable = true)
#  |-- improvement_surcharge: double (nullable = true)
#  |-- total_amount: double (nullable = true)
#  |-- congestion_surcharge: double (nullable = true)

mtrips.printSchema()

# root
#  |-- DOLocationID: integer (nullable = true)
#  |-- pcount: long (nullable = true)

推荐答案

这是解决问题的代码行:

Here is the line of code that solved the problem:

cnt_cond(col('DOLocationID').isin([i['DOLocationID'] for i in mtrips.collect()])).alias('trips_to_pop')

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