Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21228#discussion_r186276769
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
---
@@ -96,7 +96,8 @@ object Rand {
/** Generate a random column with i.i.d. values drawn from the standard
normal distribution. */
// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "_FUNC_([seed]) - Returns a random value with independent and
identically distributed (i.i.d.) values drawn from the standard normal
distribution.",
+ usage = """_FUNC_([seed]) - Returns a random value with independent and
identically distributed (i.i.d.) values drawn from the standard normal
distribution.
+ Note that the function is non-deterministic in general case.""",
--- End diff --
I mean to use a note like:
https://github.com/apache/spark/blob/2ce37b50fc01558f49ad22f89c8659f50544ffec/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala#L101-L103
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