sarutak commented on code in PR #7462:
URL: https://github.com/apache/arrow-datafusion/pull/7462#discussion_r1313414261


##########
datafusion/sqllogictest/test_files/select.slt:
##########
@@ -224,12 +224,6 @@ select
 ----
 false true false true true false false true false true true false true true 
false false true
 
-# select NaNs
-query RRRR
-select 'NaN'::double a, '-NaN'::double b, 'NaN'::float c, '-NaN'::float d
-----
-NaN -NaN NaN -NaN

Review Comment:
   I don't think so.
   I believe `NaN` and `-NaN` are finally parsed 
[here](https://github.com/Alexhuszagh/rust-lexical/blob/main/lexical-parse-float/src/parse.rs#L929).
   So, as long as `f32::NAN`, `f64::NAN`, `-f32::NAN` and `-f64::NAN` follows 
IEEE 754, simple literals should not be impacted.
   
   But the [string representation needs to be `NaN` regardless of `NaN` or 
`-NaN`](https://github.com/apache/arrow-datafusion/pull/7462/files#diff-4a5281b565761d7b0e1a53c80a44c3ef00d17855b418a39ddf4ceaef7230e46cR46).
   So this test should be changed.



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