cloud-fan commented on PR #45105:
URL: https://github.com/apache/spark/pull/45105#issuecomment-1952939546

   > AFAIK there is no such thing
   
   Yes, and we should mention it in the PR description. We still map string 
with collation to parquet string type. This means we don't support cross-engine 
compatibility (collation is ignored when reading parquet files with other 
engines like Presto). It's OK, but we need to call it out.


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