maropu commented on issue #28123: [SPARK-31350][SQL] Coalesce bucketed tables for join if applicable URL: https://github.com/apache/spark/pull/28123#issuecomment-611844105 > This optimization always works well? e.g., 100000 buckets vs 2 buckets. >> Not always, so this is enabled if spark.sql.bucketing.coalesce is set to true. If so, I think we need a threshold config to turn of this optimization if the numbers of joined buckets have a large gap.
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