Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7589#discussion_r35693133
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -258,3 +305,125 @@ case class DateFormatClass(left: Expression, right:
Expression) extends BinaryEx
})
}
}
+
+/**
+ * Time Adds Interval.
+ */
+case class TimeAdd(left: Expression, right: Expression)
+ extends BinaryExpression with ExpectsInputTypes {
+
+ override def toString: String = s"$left + $right"
+ override def inputTypes: Seq[AbstractDataType] =
+ Seq(TypeCollection(DateType, TimestampType), IntervalType)
+
+ override def dataType: DataType = TimestampType
+
+ override def nullSafeEval(start: Any, interval: Any): Any = {
+ val itvl = interval.asInstanceOf[Interval]
+ left.dataType match {
+ case DateType =>
+ DateTimeUtils.dateAddFullInterval(
+ start.asInstanceOf[Int], itvl.months, itvl.microseconds)
+ case TimestampType =>
+ DateTimeUtils.timestampAddFullInterval(
+ start.asInstanceOf[Long], itvl.months, itvl.microseconds)
+ }
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ val dtu = DateTimeUtils.getClass.getName.stripSuffix("$")
+ left.dataType match {
+ case DateType =>
+ defineCodeGen(ctx, ev, (sd, i) => {
+ s"""$dtu.dateAddFullInterval($sd, $i.months, $i.microseconds)"""
+ })
+ case TimestampType => // TimestampType
+ defineCodeGen(ctx, ev, (sd, i) => {
+ s"""$dtu.timestampAddFullInterval($sd, $i.months,
$i.microseconds)"""
+ })
+ }
+ }
+}
+
+/**
+ * Time Subtracts Interval.
+ */
+case class TimeSub(left: Expression, right: Expression)
+ extends BinaryExpression with ExpectsInputTypes {
+
+ override def toString: String = s"$left - $right"
+ override def inputTypes: Seq[AbstractDataType] =
+ Seq(TypeCollection(DateType, TimestampType), IntervalType)
+
+ override def dataType: DataType = TimestampType
+
+ override def nullSafeEval(start: Any, interval: Any): Any = {
+ val itvl = interval.asInstanceOf[Interval]
+ left.dataType match {
+ case DateType =>
+ DateTimeUtils.dateAddFullInterval(
+ start.asInstanceOf[Int], 0 - itvl.months, 0 - itvl.microseconds)
+ case TimestampType =>
+ DateTimeUtils.timestampAddFullInterval(
+ start.asInstanceOf[Long], 0 - itvl.months, 0 - itvl.microseconds)
+ }
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ val dtu = DateTimeUtils.getClass.getName.stripSuffix("$")
+ left.dataType match {
+ case DateType =>
+ defineCodeGen(ctx, ev, (sd, i) => {
+ s"""$dtu.dateAddFullInterval($sd, 0 - $i.months, 0 -
$i.microseconds)"""
+ })
+ case TimestampType => // TimestampType
+ defineCodeGen(ctx, ev, (sd, i) => {
+ s"""$dtu.timestampAddFullInterval($sd, 0 - $i.months, 0 -
$i.microseconds)"""
+ })
+ }
+ }
+}
+
+/**
+ * Returns the date that is num_months after start_date.
+ */
+case class AddMonths(left: Expression, right: Expression)
+ extends BinaryExpression with ImplicitCastInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType,
IntegerType)
+
+ override def dataType: DataType = DateType
+
+ override def nullSafeEval(start: Any, months: Any): Any = {
+ DateTimeUtils.dateAddYearMonthInterval(start.asInstanceOf[Int],
months.asInstanceOf[Int])
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ val dtu = DateTimeUtils.getClass.getName.stripSuffix("$")
+ defineCodeGen(ctx, ev, (sd, m) => {
+ s"""$dtu.dateAddYearMonthInterval($sd, $m)"""
+ })
+ }
+}
+
+/**
+ * Returns number of months between dates date1 and date2.
+ */
+case class MonthsBetween(left: Expression, right: Expression)
+ extends BinaryExpression with ImplicitCastInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(TimestampType,
TimestampType)
--- End diff --
Why not use DateType?
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