Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6986#discussion_r35608581
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -573,4 +573,50 @@ object DateTimeUtils {
dayInYear - 334
}
}
+
+ /**
+ * Returns Day of week from String. Starting from Thursday, marked as 0.
+ * (Because 1970-01-01 is Thursday).
+ */
+ def getDayOfWeekFromString(string: UTF8String): Int = {
+ val dowString = string.toString.toUpperCase
+ dowString match {
+ case "SU" | "SUN" | "SUNDAY" => 3
+ case "MO" | "MON" | "MONDAY" => 4
+ case "TU" | "TUE" | "TUESDAY" => 5
+ case "WE" | "WED" | "WEDNESDAY" => 6
+ case "TH" | "THU" | "THURSDAY" => 0
+ case "FR" | "FRI" | "FRIDAY" => 1
+ case "SA" | "SAT" | "SATURDAY" => 2
+ case _ => -1
+ }
+ }
+
+ /**
+ * Returns the first date which is later than startDate and is of the
given dayOfWeek.
+ * dayOfWeek is an integer ranges in [0, 6], and 0 is Thu, 1 is Fri,
etc,.
+ */
+ def getNextDateForDayOfWeek(startDate: Int, dayOfWeek: Int): Int = {
+ startDate + 1 + ((dayOfWeek - 1 - startDate) % 7 + 7) % 7
+ }
+
+ /**
+ * number of days in a non-leap year.
+ */
+ private[this] val days = Seq(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30,
31)
--- End diff --
Seq -> Array for faster access
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