Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21482#discussion_r192549119
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -199,6 +199,50 @@ case class Nvl2(expr1: Expression, expr2: Expression,
expr3: Expression, child:
override def sql: String = s"$prettyName(${expr1.sql}, ${expr2.sql},
${expr3.sql})"
}
+/**
+ * Evaluates to `true` iff it's Infinity.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(expr) - Returns True if expr evaluates to infinite else
returns False ",
--- End diff --
True -> true, False -> false to be consistent
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