Github user anabranch commented on a diff in the pull request:
https://github.com/apache/spark/pull/16138#discussion_r91134077
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -1047,6 +1047,53 @@ case class ToDate(child: Expression) extends
UnaryExpression with ImplicitCastIn
}
/**
+ * Parses a column with a format to a timestamp.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(timestamp_str, fmt) - Parses the `timestamp` expression
" +
+ "with the `fmt` expression.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_('2016-12-31', 'yyyy-MM-dd');
+ 2016-12-31
+ """)
+case class ParseToDate(left: Expression, right: Expression, child:
Expression)
+ extends RuntimeReplaceable with ImplicitCastInputTypes {
+
+ def this(left: Expression, format: Expression) = {
+ this(left, format, ToDate(new ParseToTimestamp(left, format)))
+ }
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(StringType,
StringType)
+ override def dataType: DataType = DateType
+ override def flatArguments: Iterator[Any] = Iterator(left, right)
+ override def sql: String = s"$prettyName(${left.sql}, ${right.sql})"
+}
+
+/**
+ * Parses a column with a format to a timestamp.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(timestamp, fmt) - Parses the `timestamp` expression with
the `fmt` expression.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_('2016-12-31', 'yyyy-MM-dd');
+ 2016-12-31 00:00:00.0
+ """)
+case class ParseToTimestamp(left: Expression, right: Expression, child:
Expression)
+ extends RuntimeReplaceable with ImplicitCastInputTypes {
+
+ def this(left: Expression, format: Expression) = {
+ this(left, format, Cast(UnixTimestamp(left, format), TimestampType))
--- End diff --
For reasons unbeknownst to me, Cast(...., TimestampType) is not equivalent
to ....cast("timestamp")
---
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