andygrove commented on PR #6413:
URL: 
https://github.com/apache/datafusion-comet/pull/6413#issuecomment-5951005308

   Added both in d66bcee0f:
   
   - A map-of-float case in the `shapes` closure in `murmur3.rs` (float as both 
key and value, checked for murmur3 and xxhash64), and a `hash(map(-d, -f))` / 
`xxhash64(map(-d, -f))` query in `hash.sql`. Spark rejects hashing a map by 
default, so the file now sets `spark.sql.legacy.allowHashOnMapType=true`.
   - `nested_floats_fold_negative_zero_and_nan` in `hll_plus_plus.rs`, which 
runs a struct-of-float and a list-of-float through the accumulator and expects 
the two zeros and the NaN bit patterns to count as 2 distinct values.
   


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