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https://issues.apache.org/jira/browse/SPARK-21653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174514#comment-16174514
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Liang-Chi Hsieh commented on SPARK-21653:
-----------------------------------------

I just go through all SQL expressions. Looks like we have expression 
description for them now, except for CASE WHEN, if I don't miss any of SQL 
expressions. I created a trivial ticket for CASE WHEN.

> Complement SQL expression document
> ----------------------------------
>
>                 Key: SPARK-21653
>                 URL: https://issues.apache.org/jira/browse/SPARK-21653
>             Project: Spark
>          Issue Type: Umbrella
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Liang-Chi Hsieh
>
> We have {{ExpressionDescription}} for SQL expressions. The expression 
> description tells what an expression's usage, arguments, and examples. Users 
> can understand how to use those expressions by {{DESCRIBE}} command in SQL:
> {code}
> spark-sql> DESCRIBE FUNCTION EXTENDED In;
> Function: in
> Class: org.apache.spark.sql.catalyst.expressions.In
> Usage: expr1 in(expr2, expr3, ...) - Returns true if `expr` equals to any 
> valN.
> Extended Usage:
>     No example/argument for in.
> {code}
> Not all SQL expressions have complete description now. For example, in the 
> above case, there is no example for function {{in}}. This task is going to 
> complement the expression description.



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