schenksj commented on issue #4522:
URL: 
https://github.com/apache/datafusion-comet/issues/4522#issuecomment-4580855734

   Closing — this won't be extracted as a standalone PR.
   
   The reorder (moving the `hasMetadataCol` reject after the 
`FileSourceScanExec` case) is **behavior-preserving** for any build without a 
V1 scan contrib: a V1 metadata-column scan still declines (just inside 
`transformV1Scan` rather than before it), and V2 is unchanged. So on upstream 
`main` there is no input that behaves differently before vs. after — it's pure 
enablement for an optional V1 contrib to intercept metadata-column scans first, 
with no standalone behavior change to test.
   
   Rather than open a core PR that is a no-op on its own, the reorder will land 
as part of the DataFusion Comet Delta integration PR (the only consumer that 
gives it meaning), as a focused commit with an equivalence test asserting 
non-contrib V1 metadata-column scans still decline.


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