UDFs to flatten a bag
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Key: PIG-2166
URL: https://issues.apache.org/jira/browse/PIG-2166
Project: Pig
Issue Type: Improvement
Reporter: Daniel Dai
Priority: Minor
Get several request for a UDF to flatten a bag. Seems reasonable to create one
in builtin:
1. BagToTuple: {(a),(b),(c)} -> (a,b,c)
2. BagToString(delimit="_"): {(a),(b),(c) -> "a_b_c"
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