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https://issues.apache.org/jira/browse/SPARK-36544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17402366#comment-17402366
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Kousuke Saruta commented on SPARK-36544:
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[~laurikoobas]
The behavior was changed. See SPARK-35581.
> Special strings for dates are no longer automatically converted without the
> "date" keyword
> ------------------------------------------------------------------------------------------
>
> Key: SPARK-36544
> URL: https://issues.apache.org/jira/browse/SPARK-36544
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.2
> Environment: Databricks Runtime 9.0
> Reporter: Lauri Koobas
> Priority: Major
>
> Comparison of a date type and a special string fail with DBR 9.0.
> Works in earlier versions, returns "false":
> {{select current_date > 'today'}}
> With DBR 9.0 the same query returns "null"
> Version that works in DBR 9.0:
> {{select current_date > *date* 'today'}}
> It's especially bad because people have written a lot of queries without
> using this keyword and now all of those queries just silently fail as the
> comparison returns a NULL.
> Works (or rather fails) in the same way with all comparison operations.
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