RussellSpitzer commented on issue #14043:
URL: https://github.com/apache/iceberg/issues/14043#issuecomment-3282427555

   1. I .... am not sure here. Theoretically I don't think there should be a 
problem with doing this.
   2. Parquet files written by Iceberg libraries *do include field ids* and 
these are used when reading. Iceberg starts with field ids, then if they are 
missing uses the default name mapping, and if that is missing uses positional 
mapping. See the Spec for notes on column projection
   3. Possibly
   4. Not sure, it sounds like there are real bugs here? In general though I 
recommend against using Map types in columnar data types since they can't be 
efficiently used for pruning. Now that we have Variants I think those are 
generally a better approach but ymmv


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