[HIVE-45] Hive: GenericUDF and support of complex object

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Component/s: Query Processor
• Assignee: Zheng Shao
• Reporter: Zheng Shao
• Created: 20/Sep/08 02:02
• Updated: 02/May/13 02:29
• Resolved: 05/May/09 01:12

Description

GenericUDF are more powerful than UDF in the following ways:
1. It can accept arguments of complex types, and return complex types.
2. It can accept variable length of arguments.
3. It can accept an infinite number of function signature - for example, it's easy to write a GenericUDF that accepts array<int>, array<array<int>> and so on (arbitrary levels of nesting).
4. It can do short-circuit evaluations.

Issue Links

• is depended upon by: HIVE-164 Support CASE statement using GenericUDF
• is depended upon by: HIVE-470 Support COALESCE using GenericUDF