andygrove opened a new issue, #4193:
URL: https://github.com/apache/datafusion-comet/issues/4193

   Sub-issue of #4098.
   
   ## Description
   
   Two tests fail in \`Spark 4.1, JDK 17/auto [exec]\`:
   
   - \`test BloomFilterMightContain from random input\`
   - \`bloom_filter_agg\`
   
   Comet and Spark produce different \`might_contain\` results for the same 
input.
   
   ## Suspected root cause
   
   Spark 4.1 likely changed the bloom filter binary layout, hash seed, or 
default false-positive probability. Diff \`BloomFilterImpl\` / 
\`BloomFilterAggregate\` between 4.0 and 4.1, then mirror in Comet's bloom 
filter code in \`native/spark-expr\`.


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