Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6986#discussion_r35608548
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -2392,6 +2399,16 @@ object functions {
def minute(columnName: String): Column = minute(Column(columnName))
/**
+ * Returns the first date which is later than given date sd and named as
dow.
+ * For example, next_day('2015-07-27', 'Sunday') would return
2015-08-02, which is the
+ * first Sunday later than 2015-07-27. The parameter dayOfWeek could be
2-letter, 3-letter,
+ * or full name of the day of the week (e.g. Mo, tue, FRIDAY).
+ * @group datetime_funcs
+ * @since 1.5.0
+ */
+ def next_day(sd: Column, dayOfWeek: Column): Column = NextDay(sd.expr,
dayOfWeek.expr)
--- End diff --
i think it is ok to not support that in the data frame api, since it is
very unlikely somebody will be using a non literal.
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