advancedxy opened a new pull request #25919: [SPARK-15616][SQL] Hive table supports partition pruning in JoinSelection URL: https://github.com/apache/spark/pull/25919 ### What changes were proposed in this pull request? A new optimizer strategy called `PruneHiveTablePartitions` is added, which calculates table size as the total size of pruned partitions. Thus, Spark planner can pick up `BroadcastJoin` if the size of pruned partitions is under broadcast join threshold. ### Why are the changes needed? This is a performance improvement. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Added unit tests. This is based on #18193, credits should go to @lianhuiwang.
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