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https://issues.apache.org/jira/browse/SPARK-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108894#comment-14108894
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Cheng Hao commented on SPARK-3198:
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Usually, we need the expression id in logical plan analyzing, not in
evaluation, hence we can get significant improvement by doing this.
> Generates the expression id while necessary
> -------------------------------------------
>
> Key: SPARK-3198
> URL: https://issues.apache.org/jira/browse/SPARK-3198
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Hao
>
> Currently, Catalyst harnesses the AtomicLong for the expression id generation
> algorithm, which reduce the performance dramatically in a multithread env.
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