mikedias commented on issue #23782: [SPARK-26875][SQL] Add an option on 
FileStreamSource to include modified files
URL: https://github.com/apache/spark/pull/23782#issuecomment-463460859
 
 
   Yes, that why is important to keep this option as default `false` keeping 
the `end-to-end exactly-once` guarantee. I'll add a note clarifying that in 
case of modification the whole file content will be processed again. 
   
   I like the "modified file" because it's just what it is. If I change to 
"overwritten files" it might be misunderstood as a content comparison, which is 
harder to address.

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