how can handle left outer join for any two dataset

[hagersaleh]

how can handle left outer join for any two dataset this dataset inlcude any
filed number
example

data set one
 ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple4&lt;Integer, String, String,String>>
customer=env.readCsvFile("/home/hadoop/Desktop/Dataset/customer.csv")
.fieldDelimiter('|')
.includeFields("11110000").ignoreFirstLine()
.types(Integer.class,String.class,String.class,String.class);

dataset two

 ExecutionEnvironment orders =
ExecutionEnvironment.getExecutionEnvironment();
DataSet<Tuple3&lt;Integer, String, String>
customer=env.readCsvFile("/home/hadoop/Desktop/Dataset/order.csv")
.fieldDelimiter('|')
.includeFields("11110000").ignoreFirstLine()
.types(Integer.class,String.class,String.classs);



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