[PIG-1758] Deep cast of complex type

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.9.0
• Component/s: impl
• Hadoop Flags: Reviewed
• Release Note: Enable deep cast of a tuple/bag to a tuple/bag of different inner schema
• Assignee: Daniel Dai
• Reporter: Daniel Dai
• Created: 07/Dec/10 23:43
• Updated: 04/Aug/11 00:34
• Resolved: 10/Dec/10 01:40

Description

Pig does not handle deep cast from bag -> bag, tuple -> tuple. Eg, the following script does not produce desired result:

a = load '1.txt' as (a0:bag{t:tuple(i0:double)});
b = foreach a generate (bag{tuple(int)})a0;
dump b;

The result tuple still contain int inside tuple of bag.

PIG-613 fix the case we cast bytearray > bag/tuple, we take complex type including inner types, but bag>bag, tuple->tuple is still not effective.

Issue Links

• relates to: PIG-1371 Pig should handle deep casting of complex types
• relates to: PIG-613 Casting complex type(tuple/bag/map) does not take effect