cloud-fan commented on a change in pull request #24742: [SPARK-27881][SQL]
Support CAST (... FORMAT <pattern>) expression
URL: https://github.com/apache/spark/pull/24742#discussion_r294174498
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -197,19 +199,53 @@ object Cast {
* When cast from/to timezone related types, we need timeZoneId, which will be
resolved with
* session local timezone by an analyzer [[ResolveTimeZone]].
*/
+// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "_FUNC_(expr AS type) - Casts the value `expr` to the target data
type `type`.",
+ usage = "_FUNC_(expr AS type [FORMAT fmt]) - Casts the value `expr` to the
target data type `type`.",
examples = """
Examples:
> SELECT _FUNC_('10' as int);
10
+ > SELECT _FUNC_('2016 12 31' as date FORMAT 'yyyy MM dd');
+ 2016-12-31
""")
+// scalastyle:on line.size.limit
case class Cast(child: Expression, dataType: DataType, timeZoneId:
Option[String] = None)
Review comment:
If it's justified to add `timeZoneId` to `Cast`, I think it's also justified
to add a `format: Option[String]` parameter?
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