[IMPALA-4825] Change Timestamp representation for binary compatibility with Kudu.

• Type: Improvement
• Status: Resolved
• Priority: Critical
• Resolution: Won't Do
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.9.0
• Component/s: Backend
• Labels: kudu performance
• Target Version: Impala 2.9.0
• Assignee: Matthew Jacobs
• Reporter: Alexander Behm
• Created: 25/Jan/17 23:18
• Updated: 12/May/17 00:05
• Resolved: 12/May/17 00:05

Description

Kudu represents a timestamp as a 12-byte field in rows returned to Impala. In addition, Kudu stores the 4-byte date portion first, followed by the 8-byte time portion. Impala has those fields reversed (timestamp-value.h) and treats a timestamp as a 16-byte field.

In order to maintain Impala/Kudu tuple-format compatibility, we should change Impala's representation to match Kudu's.