[IMPALA-1462] Clean up metrics code checking for NULL

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: Impala 2.0
• Fix Version/s: Product Backlog
• Component/s: Backend
• Labels: missing ramp-up
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Matthew Jacobs
• Created: 10/Nov/14 21:48
• Updated: 22/Dec/17 17:09
• Resolved: 22/Dec/17 17:09

Description

We have a lot of code for creating/mutating metrics that checks if the objects are NULL. This is because we have tests that don't get passed a Metrics instance but we should change that to avoid all the null checking throughout the code.