[HIVE-405] Cleanup operator initialization

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.4.0
• Component/s: Query Processor
• Hadoop Flags: Reviewed
• Release Note: HIVE-405. Cleanup operator initialization. (Prasad Chakka via zshao)
• Assignee: Prasad Chakka
• Reporter: Zheng Shao
• Created: 10/Apr/09 08:07
• Updated: 17/Dec/11 00:07
• Resolved: 17/Jul/09 03:42

Description

We are always passing the same ObjectInspector, so there is no need to pass it again and again in forward.

Also there is a problem that can ONLY be fixed by passing ObjectInspector in init: Outer Joins - Outer Joins may not be able to get ObjectInspectors for all inputs, as a result, there is no way to construct an output ObjectInspector based on the inputs. Currently we have hard-coded code that assumes joins are always outputting Strings, which did break but was hidden by the old framework (because we do toString() when serializing the output, and toString() is defined for all Java Classes).

Issue Links

• is blocked by: HIVE-369 [hive] an operator operation (init/close) should be called after the operation is performed on all the parents
• is related to: HIVE-485 join assumes all columns are strings
• is related to: HIVE-164 Support CASE statement using GenericUDF