cloud-fan commented on a change in pull request #24653: [SPARK-27783][SQL] Add
customizable hint error handler
URL: https://github.com/apache/spark/pull/24653#discussion_r286862732
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/hints.scala
##########
@@ -157,3 +158,38 @@ case object SHUFFLE_REPLICATE_NL extends JoinStrategyHint
{
override def hintAliases: Set[String] = Set(
"SHUFFLE_REPLICATE_NL")
}
+
+/**
+ * The callback for implementing customized strategies of handling hint errors.
+ */
+trait HintErrorHandler {
+
+ /**
+ * Callback for an unknown hint.
+ * @param name the unrecognized hint name
+ * @param parameters the hint parameters
+ */
+ def handleHintNotRecognized(name: String, parameters: Seq[Any]): Unit
+
+ /**
+ * Callback for relation names specified in a hint that cannot be associated
with any relation
+ * in the current scope.
+ * @param name the hint name
+ * @param parameters the hint parameters
+ * @param invalidRelations the set of relation names that cannot be
associated
+ */
+ def handleHintRelationsNotFound(
+ name: String, parameters: Seq[Any], invalidRelations: Set[String]): Unit
Review comment:
nit: 4 space indentation
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