GitHub user zhztheplayer added a comment to the discussion: Gluten + Velox 
fallback when reading Delta Lake (Spark 3.5.3 + Delta 3.3.2)

> 25/12/04 17:38:43 WARN GlutenFallbackReporter: Validation failed for plan: 
> Scan json [QueryId=1], due to:
> - Unsupported file format UnknownFormat.
 
This looks normal as we haven't offloaded the JSON scan used in Delta Lake read 
yet. They are for querying Delta Lake's metadata and we don't expect them to 
cause performance overhead since they are less heavier than the actual Parquet 
data scan.

> 25/12/04 17:38:48 WARN GlutenFallbackReporter: Validation failed for plan: 
> Project[QueryId=3], due to:
> - Validation failed with exception from: ProjectExecTransformer, reason: UDF 
> name is not found!

Where is this project from? I assume it's not from the Parquet read too, which 
is also fine. Would you share the query plan for this one?

GitHub link: 
https://github.com/apache/incubator-gluten/discussions/11254#discussioncomment-15166032

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