Question

我正在尝试将基于df1.portfolio名称的2个数据帧连接到df2.portId 结果数据帧我不希望重复相同的键。

这是我到目前为止的代码

val df = spark.read.json("C:\\json\\portmast") 
val pgetsec = spark.read.json("C:\\json\\pgetsec")


val portfolio_master = df.select("PortfolioCode","Legal Entity Name","Asofdate")
val pgetsecs= pgetsec.select("TransId", "SecId","portId","GaapCurBkBal","ParBal","SetlDt","SetlPric","OrgBkBal","TradeDt","StatCurBkBal","NaicRtg","SecurityTypeCode","CamraSecType","FundType","CountryIso")
val pg = portfolio_master.join(pgetsec,Seq("PortfolioCode","portId"),"left_outer")

我得到的错误是 Exception in thread "main" org.apache.spark.sql.AnalysisException: using columns ['PortfolioCode,'portId] can not be resolved given input columns: 最终的json应该看起来像这样

|-- Portfolio Code: string (nullable = true)
|-- Legal Entity Name: string (nullable = true)
|-- Asofdate: string (nullable = true)

((SI, S&P 500 Index,9/30/2016),[0.0,Equity,Common Stock])
((SI, S&P 500 Index,9/30/2016),[0.0,Equity,Common Stock])
((SI, S&P 500 Index,9/30/2016),[0.0,Equity,Common Stock])
[SI1, S&P 500 Index,9/30/2016,CompactBuffer([0.0,Equity,Common     Stock],    [0.0,Equity,Common Stock], [0.0,Equity,Common Stock])]
root
|-- Portfolio Code: string (nullable = true)
|-- Legal Entity Name: string (nullable = true)
|-- Asofdate: string (nullable = true)
|-- Security: array (nullable = true)
|    |-- element: struct (containsNull = true)
|    |    |-- BondPrice: double (nullable = true)
|    |    |-- CoreSectorLevel1Code: string (nullable = true)
|    |    |-- CoreSectorLevel2Code: string (nullable = true)

+--------------+-------------------+---------+--------------------+
|Portfolio Code|  Legal Entity Name| Asofdate|            Security|
+--------------+-------------------+---------+--------------------+
|           SI | S&P 500 Index     |9/30/2016|[[0.0,Equity,Comm...|
+--------------+-------------------+---------+--------------------+

感谢任何帮助。

Answer 1

portId中不存在<portfolio_master，而PortfolioCode中不存在pgetsec。如果您重新阅读完整的错误消息，您会看到它解释了这一点，因为它还显示了可用的列。

您想要的是portfolio_master("PortfolioCode") === pgetsec("portId")作为您的加入条件。

spark不能使用左外连接来连接数据帧

1 个答案: