dejankrak-db commented on PR #59305:
URL: https://github.com/apache/spark/pull/59305#issuecomment-6200834754

   @HyukjinKwon, on the Parquet footer question: I would accept this and record 
it. JSON decoding stays ungated on purpose, so that a persisted schema (a table 
property, a Delta log) stays readable with the flag off, and gating it would 
turn that into an `INVALID_JSON_DATA_TYPE` failure. A Parquet footer that lists 
a `"file"` type is now decoded as a FILE column, and `spark.read.parquet` on it 
fails with `UNSUPPORTED_FILE_TYPE` instead of reading the column as a struct. I 
updated the user-facing change section of the description to say so. Parquet 
support for FILE is a later part of the SPIP (it waits for a parquet-java 
release), and that part decides how footers carry FILE. I could not confirm 
that any writer records FILE columns in a released footer, so the exposure may 
be nil today.


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