Manu Zhang created SPARK-32083:
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Summary: Unnecessary tasks are launched when input is empty with
AQE
Key: SPARK-32083
URL: https://issues.apache.org/jira/browse/SPARK-32083
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Manu Zhang
[https://github.com/apache/spark/pull/28226] meant to avoid launching
unnecessary tasks for 0-size partitions when AQE is enabled. However, when all
partitions are empty, the number of partitions will be
`spark.sql.adaptive.coalescePartitions.initialPartitionNum` and (a lot of)
unnecessary tasks are launched in this case.
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