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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