[PIG-2290] TOBAG wraps tuple parameters in another tuple

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.10.0
• Component/s: internal-udfs
• Patch Info: Patch Available
• Release Note: If the argument to TOBAG is a tuple, it does not get inserted into another tuple before being added to the bag.
• Assignee: Ryan Hoegg
• Reporter: Ryan Hoegg
• Created: 16/Sep/11 15:42
• Updated: 26/Apr/12 20:33
• Resolved: 12/Oct/11 19:06

Description

The TOBAG function indiscriminately wraps all parameters in a tuple. When I pass a list of tuples to the function, I would expect it to return a bag containing those tuples. Instead, it returns a bag containing single element tuples, where each tuple contains one of the tuples passed in.

Example:

tuples.txt

(mike,608)
(ryan,11624)
(justin,2317)

Demonstration using pig 0.9.0

grunt> TUPLE_DATA = LOAD 'tuples.txt' AS (T:tuple(name:chararray,street_number:int));
grunt> BAGGED = FOREACH TUPLE_DATA GENERATE TOBAG(T);
grunt> DESCRIBE BAGGED;
BAGGED: {{(name: chararray,street_number: int)}}
grunt> DUMP BAGGED;
({((mike,608))})
({((ryan,11624))})
({((justin,2317))})