Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6988#discussion_r35703969
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeFunctions.scala
---
@@ -337,3 +356,49 @@ case class NextDay(startDate: Expression, dayOfWeek:
Expression)
})
}
}
+
+/**
+ * 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])
--- End diff --
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