[PHOENIX-2237] Optimize search comparator in KeyValyeUtil

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.5.2
• Fix Version/s: 4.6.0, 4.5.2
• Assignee: Lars Hofhansl
• Reporter: Lars Hofhansl
• Created: 06/Sep/15 04:43
• Updated: 21/Nov/15 02:17
• Resolved: 06/Sep/15 05:59

Description

See observation in parent:

1. We are guaranteed to be passed KVs of the same row
2. There'll be at most one version for each column

#1 allows us to completely avoid comparing the row keys.
#2 Let's us do exact searches for columns. Allowing us to simplify the code - and save a bit more performance.