How do you differentiate inner bag and outer bag in Pig.

Answer»

Inner Bag	OUTER Bag
An inner bag just Contains a bag inside a tuple.	An outer bag which is also called a relation is NOTHING but a bag of TUPLES.
Example : (4,{(4,2,1),(4,3,3,)}) In this example the complete relation is an outer bag and {(4,2,1),(4,3,3,)} is an inner bag.	Example:{(park, New York),(Hollywood, Los Angeles)} Which is a bag of tuples, nothing but an outer bag.
An inner bag is a relation inside any other bag.	In an outer bag, relations are SIMILAR to relations in relational databases.

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