[HIVE-5757] Implement vectorized support for CASE

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Implemented
• Affects Version/s: 0.13.0
• Fix Version/s: 0.13.0
• Assignee: Eric N. Hanson
• Reporter: Eric N. Hanson
• Created: 06/Nov/13 17:55
• Updated: 03/Jan/14 18:28
• Resolved: 03/Jan/14 18:28

Description

Implement support for CASE in vectorized mode. The approach is to use the vectorized UDF adaptor internally. A higher-performance version that used VectorExpression subclasses was considered but not done due to complexity. Such a version potentially could be done in the future if it's important enough.

This is high priority because CASE is a fairly popular expression.

Issue Links

• contains: HIVE-5920 Implement vectorized support for CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e] END
• is related to: HIVE-5920 Implement vectorized support for CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e] END