Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/18447#discussion_r212820817 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala --- @@ -98,6 +98,29 @@ case class AssertTrue(child: Expression) extends UnaryExpression with ImplicitCa override def sql: String = s"assert_true(${child.sql})" } +@ExpressionDescription( + usage = "_FUNC_(expr) - Returns the data type of the `expr`.", + extended = """ + Examples: + > SELECT _FUNC_("a"); + string + > SELECT _FUNC_(OL); + bigint + """) --- End diff -- `since` should be added
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