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Posted to github@datafusion.apache.org by "andygrove (via GitHub)" <gi...@apache.org> on 2026/05/03 17:33:50 UTC
[I] Spark 4.1: bloom filter result mismatch (might_contain returns wrong answers) [datafusion-comet]
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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Re: [I] Spark 4.1: bloom filter result mismatch (might_contain returns wrong answers) [datafusion-comet]
Posted by "andygrove (via GitHub)" <gi...@apache.org>.
andygrove closed issue #4193: Spark 4.1: bloom filter result mismatch (might_contain returns wrong answers)
URL: https://github.com/apache/datafusion-comet/issues/4193
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