imback82 commented on issue #25015: [SPARK-28217][SQL] Allow a pluggable statistics plan visitor for a logical plan. URL: https://github.com/apache/spark/pull/25015#issuecomment-508269566 To the extent that I understand, query hints are usually used for giving the optimizer additional information about how it should handle a given query (e.g., use broadcast join). However, the computation of costs/stats requires a traversal over the entire plan. For example, how can one easily override `LogicalPlanVisitor[T].visitorJoin` behavior with a "hint"?
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