Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7805#discussion_r35941871
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -2181,6 +2181,22 @@ object functions {
*/
def unix_timestamp(s: Column, p: String): Column = UnixTimestamp(s.expr,
Literal(p))
+ /*
+ * Converts the column into DateType.
+ *
+ * @group datetime_funcs
+ * @since 1.5.0
+ */
+ def to_date(e: Column): Column = ToDate(e.expr)
+
+ /**
+ * Returns date truncated to the unit specified by the format.
--- End diff --
here we should document what the accepted values are for format
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