Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/15677#discussion_r85634741 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala --- @@ -102,8 +102,17 @@ case class UserDefinedGenerator( * }}} */ @ExpressionDescription( - usage = "_FUNC_(n, v1, ..., vk) - Separate v1, ..., vk into n rows.", - extended = "> SELECT _FUNC_(2, 1, 2, 3);\n [1,2]\n [3,null]") + usage = "_FUNC_(n, expr1, ..., exprk) - Separates `expr1`, ..., `exprk` into `n` rows.", + extended = """ + Arguments: + n - an integer literal that represents the number of output rows. + expr - an expression of any type. --- End diff -- This is an example. Have you tried the complex type?
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