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Use Hadoop FileSystem.openFile() to open files #3078

@steveloughran

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@steveloughran

Describe the enhancement requested

Use the hadoop openFile() builder API to open a file, passing down

  • the existing FileStatus (saves a HEAD on cloud stores)
  • a read policy appropriate for parquet files. This ensures that the object stores know what kind of GET/prefect/cache to do.

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Core

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