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https://issues.apache.org/jira/browse/SPARK-24640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun reopened SPARK-24640:
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This is reverted.
> size(null) returns null
> ------------------------
>
> Key: SPARK-24640
> URL: https://issues.apache.org/jira/browse/SPARK-24640
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Xiao Li
> Assignee: Maxim Gekk
> Priority: Major
> Fix For: 3.0.0
>
>
> Size(null) should return null instead of -1 in 3.0 release. This is a
> behavior change.
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