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Posted to dev@tajo.apache.org by "SeongHwa Ahn (JIRA)" <ji...@apache.org> on 2014/01/16 03:20:19 UTC
[jira] [Comment Edited] (TAJO-409) Add explored and explained
annotations to Tajo function system
[ https://issues.apache.org/jira/browse/TAJO-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872973#comment-13872973 ]
SeongHwa Ahn edited comment on TAJO-409 at 1/16/14 2:19 AM:
------------------------------------------------------------
This new patch contains all bugs and features found in review board.
The previous patch was already deleted.
was (Author: epsilon):
this patch contains all bugs and features found in review board.
> 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
> Assignee: SeongHwa Ahn
> Fix For: 0.8-incubating
>
> Attachments: TAJO-409.patch
>
>
> 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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