Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6988#discussion_r35704366
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -258,3 +258,70 @@ case class DateFormatClass(left: Expression, right:
Expression) extends BinaryEx
})
}
}
+
+/**
+ * Returns the date part of a timestamp string.
+ */
+case class ToDate(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType)
+
+ override def dataType: DataType = DateType
+
+ override def eval(input: InternalRow): Any = {
+ child.eval(input).asInstanceOf[Int]
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ nullSafeCodeGen(ctx, ev, (time) => {
+ time
+ })
+ }
+}
+
+/**
+ * Returns date truncated to the unit specified by the format.
+ */
+case class Trunc(date: Expression, format: Expression)
+ extends BinaryExpression with ImplicitCastInputTypes {
+ override def left: Expression = date
+ override def right: Expression = format
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType,
StringType)
+ override def dataType: DataType = DateType
+
+ override def nullSafeEval(d: Any, fmt: Any): Any = {
+ val minItem =
DateTimeUtils.getFmt(fmt.asInstanceOf[UTF8String].toUpperCase.toString)
+ if (minItem == -1) {
+ // unknown format
+ null
+ } else {
+ val days = d.asInstanceOf[Int]
+ val year = DateTimeUtils.getYear(days)
+ if (minItem == Calendar.YEAR) {
+ days - DateTimeUtils.getDayInYear(days) + 1
+ } else {
+ // trunc to MONTH
+ days - DateTimeUtils.getDayOfMonth(days) + 1
+ }
+ }
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ nullSafeCodeGen(ctx, ev, (dateVal, fmt) => {
+ val dtu = DateTimeUtils.getClass.getName.stripSuffix("$")
--- End diff --
It's good idea to import `DateTimeUtils` in codegen by default.
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