Beam FileIO should support versioned file systems
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files
io
java
new feature
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Description
Some file systems (e.g. GCS) are versioned, and support reading previous generations of files. Since Beam's file support does not currently support this concept, the latest versions of files are always the ones returned. Users should be able to specify that they want to read a previous version of a file in FileIO.
Imported from Jira [BEAM-4822](https://issues.apache.org/jira/browse/BEAM-4822). Original Jira may contain additional context.
Reported by: reuvenlax.
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