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hadoopapache-pig

disambiguate Operator usage with example in Apache Pig

What is the usage of disambiguate operator :: in PIG. It is used in JOIN,FILTER,FLATTEN and so on. Thanks in advance !

Solution

  • It is not used in JOIN,FILTER,FLATTEN.It is used to identify the fields in a relation after JOIN, COGROUP, CROSS, or FLATTEN operators.Click Source to see an example.

    You use JOIN, COGROUP, CROSS operators on more than 1 relation,except for FLATTEN.This will result in a relation that is made of fields from more than 1 relation.In that case to identify the fields you will have to use the disambiguate operator.