Gengliang Wang created SPARK-28089:
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             Summary: File source v2: support reading output of file streaming 
Sink
                 Key: SPARK-28089
                 URL: https://issues.apache.org/jira/browse/SPARK-28089
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Gengliang Wang


File source V1 supports reading output of FileStreamSink as batch. 
https://github.com/apache/spark/pull/11897
We should support this in file source V2 as well. When reading with paths, we 
first check if there is metadata log of FileStreamSink. If yes, we use 
`MetadataLogFileIndex` for listing files; Otherwise, we use `InMemoryFileIndex`.



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