Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20015#discussion_r157677400
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -2797,6 +2797,21 @@ object functions {
TruncDate(date.expr, Literal(format))
}
+ /**
+ * Returns timestamp truncated to the unit specified by the format.
+ *
+ * @param format: 'year', 'yyyy', 'yy' for truncate by year,
+ * 'month', 'mon', 'mm' for truncate by month,
+ * 'day', 'dd' for truncate by day,
+ * Other options are: second, minute, hour, week, month,
quarter
--- End diff --
Maybe, `'second', 'minute', 'hour', 'week', 'month' and 'quarter'`
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