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https://issues.apache.org/jira/browse/SPARK-29013?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh resolved SPARK-29013.
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Resolution: Won't Fix
> Structurally equivalent subexpression elimination
> -------------------------------------------------
>
> Key: SPARK-29013
> URL: https://issues.apache.org/jira/browse/SPARK-29013
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: L. C. Hsieh
> Priority: Major
>
> We do semantically equivalent subexpression elimination in SparkSQL. However,
> for some expressions that are not semantically equivalent, but structurally
> equivalent, current subexpression elimination generates too many similar
> functions. These functions share same computation structure but only differ
> in input slots of current processing row.
> For such expressions, we can generate just one function, and pass in input
> slots during runtime.
> It can reduce the length of generated code text, and save compilation time.
>
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