steveloughran commented on issue #10392:
URL: https://github.com/apache/iceberg/issues/10392#issuecomment-4129734253

   in #15628/#15629 I'm adding benchmarks for variant read (plus something 
similar in parquet).
   The current numbers (see the issue) show a major performance penalty doing 
simple queries over shedded variants -things get about twice as slow as 
unshedded. That hints to me that there's reconstruction of the variant struct 
going on before query execution


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