aokolnychyi commented on pull request #1466:
URL: https://github.com/apache/iceberg/pull/1466#issuecomment-693717726


   @rdblue @RussellSpitzer @manishmalhotrawork Right now, we have a UDF to 
produce file names that we use in the join condition. What about having a UDF 
that would take 2 strings (one actual location and one location referenced in 
the metadata) and produce a boolean to indicate whether they match or not. 
Inside the UDF, we can construct `Path` from `String`, call `toUri` on it, and 
then call `getScheme` and `getPath`. Path parts must match and the scheme in 
the metadata may be either null or must match the actual one.


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