[jira] [Resolved] (SPARK-14415) All functions should show usages by command `DESC FUNCTION`

["Yin Huai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yin Huai resolved SPARK-14415.
------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request 12185
[https://github.com/apache/spark/pull/12185]

> All functions should show usages by command `DESC FUNCTION`
> -----------------------------------------------------------
>
>                 Key: SPARK-14415
>                 URL: https://issues.apache.org/jira/browse/SPARK-14415
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Dongjoon Hyun
>             Fix For: 2.0.0
>
>
> Currently, many functions do now show usages like the followings.
> {code}
> scala> sql("desc function extended `sin`").collect().foreach(println)
> [Function: sin]
> [Class: org.apache.spark.sql.catalyst.expressions.Sin]
> [Usage: To be added.]
> [Extended Usage:
> To be added.]
> {code}
> This PR adds descriptions for functions and adds a testcase prevent adding function without usage.
> {code}
> scala>  sql("desc function extended `sin`").collect().foreach(println);
> [Function: sin]
> [Class: org.apache.spark.sql.catalyst.expressions.Sin]
> [Usage: sin(x) - Returns the sine of x.]
> [Extended Usage:
> > SELECT sin(0);
>  0.0]
> {code}
> The only exceptions are `cube`, `grouping`, `grouping_id`, `rollup`, `window`.



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