Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6986#discussion_r35490339
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -258,3 +258,62 @@ case class DateFormatClass(left: Expression, right:
Expression) extends BinaryEx
})
}
}
+
+/**
+ * Returns the last day of the month which the date belongs to.
+ */
+case class LastDay(startDate: Expression) extends UnaryExpression with
ImplicitCastInputTypes {
+ override def child: Expression = startDate
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType)
+
+ override def dataType: DataType = DateType
+
+ override def nullSafeEval(date: Any): Any = {
+ val days = date.asInstanceOf[Int]
+ DateTimeUtils.getLastDayOfMonth(days)
+ }
+
+ override protected def genCode(ctx: CodeGenContext, ev:
GeneratedExpressionCode): String = {
+ val dtu = DateTimeUtils.getClass.getName.stripSuffix("$")
+ defineCodeGen(ctx, ev, (sd) => {
+ s"$dtu.getLastDayOfMonth($sd)"
+ })
+ }
+}
+
+/**
+ * Returns the first date which is later than start_date and named as
day_of_week.
--- End diff --
we need to give an example here; otherwise it is impossible to understand
the function
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