[TAJO-500] Add description annotation to functions

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 0.8.0
• Component/s: Function/UDF
• Assignee: SeongHwa Ahn
• Reporter: SeongHwa Ahn
• Created: 14/Jan/14 02:46
• Updated: 15/Jan/14 06:56
• Resolved: 15/Jan/14 06:56

Description

1. Add description annotation to functions

• description(): simple explanation
• detail(): detailed explanation
• example: example
• functionName: function name
• synonyms : synonyms for function name
• returnType: return type
• paramTypes: parameter type

2. Change the function registration method during TajoMaster start-up. Every subclass of org.apache.tajo.catalog.function.Function must be registered automatically.

3. Add web page for function list