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https://issues.apache.org/jira/browse/SPARK-28306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16883399#comment-16883399
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Apache Spark commented on SPARK-28306:
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User 'yeshengm' has created a pull request for this issue:
https://github.com/apache/spark/pull/25126
> Once optimizer rule NormalizeFloatingNumbers is not idempotent
> --------------------------------------------------------------
>
> Key: SPARK-28306
> URL: https://issues.apache.org/jira/browse/SPARK-28306
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yesheng Ma
> Assignee: Yesheng Ma
> Priority: Major
> Fix For: 3.0.0
>
>
> When the rule NormalizeFloatingNumbers is called multiple times, it will add
> additional transform operator to an expression, which is not appropriate. To
> fix it, we have to make it idempotent, i.e. yield the same logical plan
> regardless of multiple runs.
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