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https://issues.apache.org/jira/browse/SPARK-21653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116282#comment-16116282
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Liang-Chi Hsieh commented on SPARK-21653:
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[~hyukjin.kwon] oh, yeah, looks like it's. As SPARK-17963 titled as "Add
examples (extend) in each expression", I'm not sure if we intentionally leave
the expressions without detailed description?
> 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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