Is there a way to create a reader without a seekable stream?

[prezaei]

Issue description

I am loading the file from Azure blob and want to avoid copying the entire content over and get a seekable stream. Also want to avoid loading the file into memory. Is there a forward only reader that does not need a seekable stream?

[aloneguid]

Unfortunately, parquet metadata required to read the file is located at the end of the stream, because parquet format is optimised for writing, therefore we can't process forward-only streams.