Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/17291
  
    Thank you for cc'ing me @cloud-fan. Yes, I support this idea and my final 
plan was also the de-duplication.
    
    One thing I am worried of is though, some code paths (for example, 
`DataFrameReader.json(jsonDataset: Dataset[String])` and 
`DataFrameReader.csv(csvDataset: Dataset[String])`) directly use 
`JacksonParser` or `UnivocityParser`. If it is generalized in `FileScanRDD`, I 
am worried of missing the variants if I understood correctly. 


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