Hyunsik Choi created TAJO-409:
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Summary: Add explored and explained annotations to Tajo function
system
Key: TAJO-409
URL: https://issues.apache.org/jira/browse/TAJO-409
Project: Tajo
Issue Type: Sub-task
Components: function/udf
Reporter: Hyunsik Choi
Fix For: 0.8-incubating
Currently, it is hard for developers to add explanations to functions and
user-defined functions. Java has annotation feature. We can make function
system more explored and explained with java annotations.
h3. Proposal
A function should have the following annotations
* function name (string) - optional
** If a function is user-defined, this field is ignored.
** the function name of user-defined function is given when it is registered.
* synonyms (string []) - optional
** If a function is user-defined, this field is ignored.
** One or more aliases can be described.
* description (string)
** *one* line explanation for a function
* detail (string) - optional
** more explanations which can be two or more lines
* example
** what are parameters and what is a result.
Function signatures can be derived from function name, parameters, and return
types.
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