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https://issues.apache.org/jira/browse/SPARK-52575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gengliang Wang resolved SPARK-52575.
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Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 51282
[https://github.com/apache/spark/pull/51282]
> Introduce contextIndependentFoldable attribute for Expressions
> --------------------------------------------------------------
>
> Key: SPARK-52575
> URL: https://issues.apache.org/jira/browse/SPARK-52575
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Gengliang Wang
> Assignee: Gengliang Wang
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> Introduces a method to determine whether an expression can be folded without
> relying on any external context (e.g., time zone, session configurations, or
> catalogs). If an expression is context-independent foldable, it can be safely
> evaluated during DDL operations such as creating tables, views, or
> constraints. This enables systems to store the computed value rather than the
> original expression, simplifying implementation and improving performance. By
> default, expressions are not considered context-independent foldable to
> ensure explicit annotation of context independence.
>
> *Good examples (context-independent foldable):*
> * 1 + 1
> _Always produces 2, regardless of context._
> * 1 > 0
> _Always evaluates to true._
> * CAST('2025-08-01' AS DATE)
> _Always gives the same date value._
>
> {*}Bad examples (not context-independent foldable):{*}{*}{*}
> * CURRENT_DATE
> _Result depends on the current date and time zone._
> * CURRENT_USER
> _Result depends on the session/user context._
> * CAST('2025-08-01 00:00:00' AS TIMESTAMP)
> _Result can vary depending on the session time zone setting_
>
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