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https://issues.apache.org/jira/browse/SPARK-23424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364653#comment-16364653
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Apache Spark commented on SPARK-23424:
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User 'kiszk' has created a pull request for this issue:
https://github.com/apache/spark/pull/20612
> Add codegenStageId in comment
> -----------------------------
>
> Key: SPARK-23424
> URL: https://issues.apache.org/jira/browse/SPARK-23424
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Kazuaki Ishizaki
> Priority: Minor
>
> SPARK-23032 introduced to use a per-query ID to the generated class name in
> {{WholeStageCodegenExec.}}This Jira also add the ID in the comment of the
> generated Java source file.
> This is helpful for debugging when {{spark.sql.codegen.useIdInClassName}} is
> false.
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