cloud-fan commented on a change in pull request #25997: [SPARK-29326][SQL] ANSI
store assignment policy: throw exception on casting failure
URL: https://github.com/apache/spark/pull/25997#discussion_r330997830
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -1647,6 +1631,50 @@ case class Cast(child: Expression, dataType: DataType,
timeZoneId: Option[String
}
}
+/**
+ * Cast the child expression to the target data type.
+ *
+ * When cast from/to timezone related types, we need timeZoneId, which will be
resolved with
+ * session local timezone by an analyzer [[ResolveTimeZone]].
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(expr AS type) - Casts the value `expr` to the target data
type `type`.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_('10' as int);
+ 10
+ """)
+case class Cast(child: Expression, dataType: DataType, timeZoneId:
Option[String] = None)
+ extends CastBase {
+ override def withTimeZone(timeZoneId: String): TimeZoneAwareExpression =
+ copy(timeZoneId = Option(timeZoneId))
+
+ override protected val ansiEnabled: Boolean = SQLConf.get.ansiEnabled
+}
+
+/**
+ * Cast the child expression to the target data type as per ANSI SQL standard.
+ * A runtime exception will be thrown on casting failure such as converting an
out-of-range value
+ * to an integral type.
+ *
+ * When cast from/to timezone related types, we need timeZoneId, which will be
resolved with
+ * session local timezone by an analyzer [[ResolveTimeZone]].
+ */
+@ExpressionDescription(
Review comment:
Users can't use this function directly. I don't think we need the doc here.
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