[jira] [Created] (FLINK-20174) Make BulkFormat more extensible

[Shang Yuanchun (Jira)]

Steven Zhen Wu created FLINK-20174:
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             Summary: Make BulkFormat more extensible
                 Key: FLINK-20174
                 URL: https://issues.apache.org/jira/browse/FLINK-20174
             Project: Flink
          Issue Type: Improvement
          Components: Connectors / FileSystem
    Affects Versions: 1.12.0
            Reporter: Steven Zhen Wu


Right now, BulkFormat has the generic `SpitT` type extending from `FileSourceSplit`. We can make BulkFormat taking the generic `SplitT` type extending from `SourceSplit`. This way, IcebergSourceSplit doesn't have to extend from `FileSourceSplit` and Iceberg source can reuse this BulkFormat interface as [~lzljs3620320] suggested. This allows Iceberg source to take advantages high-performant `ParquetVectorizedInputFormat` provided by Flink.  

[~sewen] [~lzljs3620320] if you are onboard with the change, I would be happy to submit a PR. Although there is a question if it is ok to make the API change after 1.12.0 code freeze?

The other related question is the two `createReader` and `restoreReader` APIs. I understand the motivation. I am just wondering if the separation is necessary. if the SplitT has the CheckpointedLocation, the seek operation can be handled internal to `createReader`.




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