Liang-Chi Hsieh commented on SPARK-21653:

[~sowen] I made a detailed description now for this. Is it clear now for you?

> 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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