Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16138#discussion_r99308570
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -1047,6 +1048,69 @@ case class ToDate(child: Expression) extends
UnaryExpression with ImplicitCastIn
}
/**
+ * Parses a column to a date based on the given format.
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(date_str, fmt) - Parses the `left` expression with the
`fmt` expression. Returns null with invalid input.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_('2016-12-31', 'yyyy-MM-dd');
+ 2016-12-31
+ """)
+// scalastyle:on line.size.limit
+case class ParseToDate(left: Expression, format: Option[Expression],
child: Expression)
+ extends RuntimeReplaceable {
+
+ def this(left: Expression, format: Expression) {
+ this(left, Option(format),
+ Cast(Cast(UnixTimestamp(left, format), TimestampType), DateType))
+ }
+
+ def this(left: Expression) = {
+ // backwards compatability
+ this(left, Option(null), ToDate(left))
+ }
+
+ override def flatArguments: Iterator[Any] = Iterator(left, format)
+ override def sql: String = {
+ if (format.isDefined) {
+ s"$prettyName(${left.sql}, ${format.get.sql}"
+ } else {
+ s"$prettyName(${left.sql})"
+ }
+ }
+
+ override def prettyName: String = "to_date"
+}
+
+/**
+ * Parses a column to a timestamp based on the supplied format.
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(timestamp, fmt) - Parses the `left` expression with the
`format` expression to a timestamp. Returns null with invalid input.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_('2016-12-31', 'yyyy-MM-dd');
+ 2016-12-31 00:00:00.0
+ """)
+// scalastyle:on line.size.limit
+case class ParseToTimestamp(left: Expression, format: Expression, child:
Expression)
+ extends RuntimeReplaceable {
+
+ def this(left: Expression, format: Expression) = {
+ this(left, format, Cast(UnixTimestamp(left, format), TimestampType))
+}
+
+ override def flatArguments: Iterator[Any] = Iterator(left, format)
+ override def sql: String = s"$prettyName(${left.sql}, ${format.sql})"
--- End diff --
does it have the same issue as `ParseToDate`?
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