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https://issues.apache.org/jira/browse/SPARK-24121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458574#comment-16458574
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Apache Spark commented on SPARK-24121:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/21193

> The API for handling expression code generation in expression codegen
> ---------------------------------------------------------------------
>
>                 Key: SPARK-24121
>                 URL: https://issues.apache.org/jira/browse/SPARK-24121
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Liang-Chi Hsieh
>            Priority: Major
>
> In order to achieve the replacement of expr value during expression codegen 
> (please see the proposal at 
> [https://github.com/apache/spark/pull/19813#issuecomment-354045400),] we need 
> an API to handle the insertion of temporary symbols for statements generated 
> by expressions. This API must allow us to know what statement expressions are 
> during codegen and to use symbols instead of actual codes when generating 
> java codes.



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