andygrove commented on issue #2190:
URL: 
https://github.com/apache/datafusion-comet/issues/2190#issuecomment-3215145128

   > I don't understand what this needs from `native_iceberg_compat`. Collation 
sequences are needed for sort. Is the requirement to ensure that the Spark type 
does not drop the collation information during the scan?
   
   I really don't know yet. For now, we just want to fall back to Spark for any 
queries where the schema has string collation types and the scan is the first 
place where we see this.
   
   It has been a while since I started looking into this, but IIRC, I was 
getting errors in the scan when converting the Spark schema to the Arrow schema 
because we did not recognize the string collation types.


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