[PHOENIX-32] Replace generic ColumnModifier with specific SortOrder

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.2.3
• Fix Version/s: 3.0.0
• Assignee: Simon Toens
• Reporter: Simon Toens
• Created: 10/Feb/14 13:33
• Updated: 21/Nov/15 02:17
• Resolved: 11/Feb/14 10:48

Description

We added ColumnModifier thinking that it may be a generic concept but it turns out that it is only used to describe a row key column that stores its values in descending order. In order to make the purpose of this enum more apparent and improve code readability, rename it to "SortOrder". Also make sure it is either ASC or DESC and never null