gengliangwang opened a new pull request #24066: [SPARK-27132][SQL] Improve file 
source V2 framework
URL: https://github.com/apache/spark/pull/24066
 
 
   ## What changes were proposed in this pull request?
   
   During the migration of CSV V2(https://github.com/apache/spark/pull/24005), 
I find that we can improve the file source v2 framework by:
   1. check duplicated column names in both read and write
   2. Not all the file sources support filter push down. So remove 
`SupportsPushDownFilters` from FileScanBuilder
   3. The method `isSplitable` might require data source options. Add a new 
member `options` to FileScan.
   
   ## How was this patch tested?
   
   Unit test
   

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