[jira] [Created] (SPARK-30088) Adaptive execution should convert SortMergeJoin to BroadcastJoin when plan generates empty result

["EdisonWang (Jira)" <ji...@apache.org>]

EdisonWang created SPARK-30088:
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             Summary: Adaptive execution should convert SortMergeJoin to BroadcastJoin when plan generates empty result
                 Key: SPARK-30088
                 URL: https://issues.apache.org/jira/browse/SPARK-30088
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: EdisonWang


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 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
}

```



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