ulysses-you commented on a change in pull request #28269:
URL: https://github.com/apache/spark/pull/28269#discussion_r411078284



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/dynamicpruning/PartitionPruning.scala
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@@ -109,7 +109,7 @@ object PartitionPruning extends Rule[LogicalPlan] with 
PredicateHelper {
    * the size in bytes of the partitioned plan after filtering is greater than 
the size
    * in bytes of the plan on the other side of the join. We estimate the 
filtering ratio
    * using column statistics if they are available, otherwise we use the 
config value of
-   * `spark.sql.optimizer.joinFilterRatio`.
+   * `SQLConf.DYNAMIC_PARTITION_PRUNING_FALLBACK_FILTER_RATIO`.

Review comment:
       Update the config name.




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