Github user anabranch commented on a diff in the pull request:
https://github.com/apache/spark/pull/16138#discussion_r95071556
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -1047,6 +1048,60 @@ case class ToDate(child: Expression) extends
UnaryExpression with ImplicitCastIn
}
/**
+ * Parses a column to a date based on the given format.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(date_str, fmt) - Parses the `left` expression with the
`fmt` expression.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_('2016-12-31', 'yyyy-MM-dd');
+ 2016-12-31
+ """)
+case class ParseToDate(left: Expression, format: Expression, child:
Expression)
+ extends RuntimeReplaceable {
+
+ def this(left: Expression, format: Expression) = {
+ this(left, format, Cast(new ParseToTimestamp(left, format), DateType))
+ }
+
+ def this(left: Expression) = {
+ this(left, Literal(""), ToDate(left))
--- End diff --
so this second value gets ignored completely. Not sure exactly how to
handle this.
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