[jira] [Resolved] (SPARK-21653) Complement SQL expression document

["Liang-Chi Hsieh (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21653?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liang-Chi Hsieh resolved SPARK-21653.
-------------------------------------
    Resolution: Fixed

> 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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