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https://issues.apache.org/jira/browse/SPARK-50692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jiaan Geng updated SPARK-50692:
-------------------------------
Parent: SPARK-38852
Issue Type: Sub-task (was: Improvement)
> Add RPAD pushdown support
> -------------------------
>
> Key: SPARK-50692
> URL: https://issues.apache.org/jira/browse/SPARK-50692
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 3.5.4
> Reporter: Andrej G
> Assignee: Andrej G
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> Make {{RPAD/LPAD}} function translatable (via {{{}V2ExpressionBuilder{}}})
> and it's pushdown supported (via {{V2ExpressionSQLBuilder}} as a
> {{{}visitSQLFunction{}}}).
> h3. CONTEXT:
> When trying to compare CHAR(...) and a literal, Spark injects a RPAD function
> to make the CHAR parameter the same length. This behaviour is per ANSI
> standard.
> h3. THE PROBLEM:
> RPAD is not only an unsupported, but an untranslatable function. This
> prevents CHAR + literal comparison pushdown.
> h3. THE SOLUTION:
> Support RPAD pushdowns and implement it when needed
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