Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7805#discussion_r35941935
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -696,3 +695,90 @@ case class MonthsBetween(date1: Expression, date2:
Expression)
})
}
}
+
+/**
+ * Returns the date part of a timestamp or string.
+ */
+case class ToDate(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes {
+
+ // Implicit casting of spark will accept string in both date and
timestamp format, as
+ // well as TimestampType.
+ override def inputTypes: Seq[AbstractDataType] = Seq(DateType)
+
+ override def dataType: DataType = DateType
+
+ override def eval(input: InternalRow): Any = child.eval(input)
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ defineCodeGen(ctx, ev, d => d)
+ }
+}
+
+/*
+ * Returns date truncated to the unit specified by the format.
+ */
+case class TruncDate(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 prettyName: String = "trunc"
+
+ lazy val minItemConst =
DateTimeUtils.parseTruncLevel(format.eval().asInstanceOf[UTF8String])
--- End diff --
mark this as private, and maybe rename it to truncationLevel?
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