Hyukjin Kwon commented on SPARK-21653:

Yes, there was some discussion for adding arguments in my PR.

I am still fond of describing arguments as long as they look mostly correct in 
general and the examples produce the expected results because these are some 
information that did not exist before and we now generate documentation for SQL 
builtin functions. I am willing to push this if there are no strong objections 

> 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}
> 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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