steveloughran opened a new pull request, #16133:
URL: https://github.com/apache/iceberg/pull/16133

   
   ParquetMetricsRowGroupFilter.compareVariant() implements comparisons for 
variants, including NaN, null.
   
   * New ParquetVariantUtil splitter regexp can't cope with columns called ]. 
That's OK as normalisation forbids that and empty paths
   * Copilot wrote the tests so it's over-verbose, but thorough.
   * including NaN behaviour and string truncation on max values.


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