Jungtaek Lim created SPARK-45080:
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Summary: Kafka DSv2 streaming source implementation calls
planInputPartitions 4 times per microbatch
Key: SPARK-45080
URL: https://issues.apache.org/jira/browse/SPARK-45080
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 4.0.0
Reporter: Jungtaek Lim
I was tracking through method calls for DSv2 streaming source, and figured out
planInputPartitions is called 4 times per microbatch.
It turned out that multiple calls of planInputPartitions is due to
`DataSourceV2ScanExecBase.supportsColumnar`, though it is called through
`MicroBatchScanExec.inputPartitions` which is defined as lazy, hence shouldn't
happen.
The behavior seems to be coupled with catalyst and very hard to figure out why,
but with SPARK-44505, we can at least fix this per each data source.
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