Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18134#discussion_r119002317
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -404,6 +404,44 @@ case class DayOfMonth(child: Expression) extends
UnaryExpression with ImplicitCa
// scalastyle:off line.size.limit
@ExpressionDescription(
+ usage = "_FUNC_(date) - Returns the weekday index for date/timestamp (1
= Sunday, 2 = Monday, ..., 7 = Saturday).",
--- End diff --
As Sunday, Saturday are included, it is not only weekday. `Returns the day
of the week ...`.
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