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https://issues.apache.org/jira/browse/FLINK-37957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17980462#comment-17980462
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Sergey Nuyanzin commented on FLINK-37957:
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Merged as
[edc776b403c411b2ea0d1eba3c7a77233733409f|https://github.com/apache/flink/commit/edc776b403c411b2ea0d1eba3c7a77233733409f]
> Do not write empty lists to compiled plan
> -----------------------------------------
>
> Key: FLINK-37957
> URL: https://issues.apache.org/jira/browse/FLINK-37957
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
>
> There is no need to have empty lists in compiled plans since they don't bring
> benefit however they consume space
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