Chaoqin Li created SPARK-45558:
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Summary: Introduce a metadata file for streaming stateful operator
Key: SPARK-45558
URL: https://issues.apache.org/jira/browse/SPARK-45558
Project: Spark
Issue Type: Improvement
Components: Structured Streaming
Affects Versions: 3.5.0
Reporter: Chaoqin Li
The information to store in the metadata file:
* operator name (no need to be unique among stateful operators in the query)
* state store name
* numColumnsPrefixKey: > 0 if prefix scan is enabled, 0 otherwise
The body of metadata file will be in json format. The metadata file will be
versioned just as other streaming metadata file to be future proof.
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