WangGuangxin opened a new pull request #26726: [SPARK-30088][SQL]Adaptive execution should convert SortMergeJoin to BroadcastJoin when plan generates empty result URL: https://github.com/apache/spark/pull/26726 ### What changes were proposed in this pull request? Adaptive execution should convert `SortMergeJoin` to `BroadcastJoin` if the subquery generates empty result. ### Why are the changes needed? Adaptive execution try to convert `SortMergeJoin` to `BroadcastJoin` by checking the `dataSize` metrics of spark plan. However, if the spark plan generates empty result, the `dataSize` metrics is empty due to `org.apache.spark.sql.execution.metric.SQLMetrics`'s initial value is -1, which could lead to the following check return `false` ``` private def canBroadcast(plan: LogicalPlan): Boolean = { plan.stats.sizeInBytes >= 0 && plan.stats.sizeInBytes <= conf.autoBroadcastJoinThreshold } ``` ### Does this PR introduce any user-facing change? No ### How was this patch tested? Adding a test case in `AdaptiveQueryExecSuite`
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