Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/14132#discussion_r72040264 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -1774,6 +1775,49 @@ class Analyzer( } /** + * Substitute Hints. + * - BROADCAST/BROADCASTJOIN/MAPJOIN match the closest table with the given name parameters. + * + * This rule substitutes `UnresolvedRelation`s in `Substitute` batch before `ResolveRelations` + * rule is applied. Here are two reasons. + * - To support `MetastoreRelation` in Hive module. + * - To reduce the effect of `Hint` on the other rules. + * + * After this rule, it is guaranteed that there exists no unknown `Hint` in the plan. + * All new `Hint`s should be transformed into concrete Hint classes `BroadcastHint` here. + */ + object SubstituteHints extends Rule[LogicalPlan] { + def apply(plan: LogicalPlan): LogicalPlan = plan transform { + case logical: LogicalPlan => logical transformDown { + case h @ Hint(name, parameters, child) + if Seq("BROADCAST", "BROADCASTJOIN", "MAPJOIN").contains(name.toUpperCase) => + var resolvedChild = child + + for (table <- parameters) { + var stop = false + resolvedChild = resolvedChild.transformDown { --- End diff -- I'll check again this.
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