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https://issues.apache.org/jira/browse/SPARK-29638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240649#comment-17240649
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Dylan Guedes commented on SPARK-29638:
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Hmmm I wasn't expecting this :(
I took that PgSQL would return `NaN` by reading their outputs for the golden
tests. Maybe they changed this in recent versions? oO
Anyway, if Spark is summing `NaN` as zero that stills inconsistent with PgSql.
> Spark handles 'NaN' as 0 in sums
> --------------------------------
>
> Key: SPARK-29638
> URL: https://issues.apache.org/jira/browse/SPARK-29638
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Dylan Guedes
> Priority: Major
>
> Currently, Spark handles 'NaN' as 0 in window functions, such that 3+'NaN'=3.
> PgSQL, on the other hand, handles the entire result as 'NaN', as in 3+'NaN' =
> 'NaN'
> I experienced this with the query below:
> {code:sql}
> SELECT a, b,
> SUM(b) OVER(ORDER BY A ROWS BETWEEN 1 PRECEDING AND CURRENT ROW)
> FROM (VALUES(1,1),(2,2),(3,(cast('nan' as int))),(4,3),(5,4)) t(a,b);
> {code}
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