andygrove commented on PR #6447:
URL: 
https://github.com/apache/datafusion-comet/pull/6447#issuecomment-5981351428

   Addressed in a0b1f4db5:
   
   - `float_comparisons.sql` runs `IS DISTINCT FROM` end to end, on scalars, 
constants, arrays and structs.
   - A `float_cmp_deep` table compares `ARRAY<STRUCT<v: DOUBLE>>` and 
`STRUCT<a: ARRAY<DOUBLE>>` columns under every ordering operator, and negates 
the leaves so that a NaN two levels down has the sign bit set. Stopping 
`normalize_nested_floats` after one level fails only those queries.
   - The pruning test now puts a NaN in a row group whose other values are all 
below 500, and checks that `d > 500.0D` still returns it. parquet-mr writes the 
NaN as the chunk's max statistic, so DataFusion keeps that row group.
   - Agreed on the copies for nested ordering. The fix is a comparator that 
orders nested floats the Spark way in place, as nested `=` and `<>` already 
compare; that follow-up is #6590.
   


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