ASF GitHub Bot commented on PARQUET-1246:

gszadovszky opened a new pull request #461: PARQUET-1246: Ignore float/double 
statistics in case of NaN
URL: https://github.com/apache/parquet-mr/pull/461
   Because of the ambigous sorting order of float/double the following changes 
made at the reading path of the related statistics:
   - Ignoring statistics in case of it contains a NaN value.
   - Using -0.0 as min value and +0.0 as max value independently from which 0.0 
value was saved in the statistics.

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> Ignore float/double statistics in case of NaN
> ---------------------------------------------
>                 Key: PARQUET-1246
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1246
>             Project: Parquet
>          Issue Type: Bug
>    Affects Versions: 1.8.1
>            Reporter: Gabor Szadovszky
>            Assignee: Gabor Szadovszky
>            Priority: Major
>             Fix For: 1.10.0
> The sorting order of the floating point values are not properly specified, 
> therefore NaN values can cause skipping valid values when filtering. See 
> PARQUET-1222 for more info.
> This issue is for ignoring statistics for float/double if it contains NaN to 
> prevent data loss at the read path when filtering.

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