“缺少已解决的属性"；在pySpark上执行加入时 [英] "resolved attribute(s) missing" when performing join on pySpark

问题描述

我有以下两个pySpark数据框:

I have the following two pySpark dataframe:

> df_lag_pre.columns
['date','sku','name','country','ccy_code','quantity','usd_price','usd_lag','lag_quantity']

> df_unmatched.columns
['alt_sku', 'alt_lag_quantity', 'country', 'ccy_code', 'name', 'usd_price']

现在我想将它们加入公共列，所以我尝试以下操作:

Now I want to join them on common columns, so I try the following:

> df_lag_pre.join(df_unmatched, on=['name','country','ccy_code','usd_price'])

我收到以下错误消息:

AnalysisException: u'resolved attribute(s) price#3424 missing from country#3443,month#801,price#808,category#803,subcategory#804,page#805,date#280,link#809,name#806,quantity#807,ccy_code#3439,sku#3004,day#802 in operator !EvaluatePython PythonUDF#<lambda>(ccy_code#3439,price#3424), pythonUDF#811: string;'

出现此错误的某些列(例如价格)是从其构建df_lag的另一个数据框的一部分.我找不到任何有关如何解释此消息的信息，因此将不胜感激.

Some of the columns that show up on this error, such as price, were part of another dataframe from which df_lag was built from. I can't find any info on how to interpret this message, so any help would be greatly appreciated.

推荐答案

您可以在pyspark中以这种方式执行连接，请查看这是否对您有用:

You can perform join this way in pyspark, Please see if this is useful for you:

df_lag_pre.alias("df1")
df_unmatched.alias("df2")
join_both = df1.join(df2, (col("df1.name") == col("df2.name")) & (col("df1.country") == col("df2.country")) & (col("df1.ccy_code") == col("df2.ccy_code")) & (col("df1.usd_price") == col("df2.usd_price")), 'inner')

更新:如果您收到未定义的错误，请在下面的导入中使用

Update: If you are getting col not defined error, please use below import

from pyspark.sql.functions import col

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