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https://issues.apache.org/jira/browse/SPARK-17427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15469569#comment-15469569
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Apache Spark commented on SPARK-17427:
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User 'adrian-wang' has created a pull request for this issue:
https://github.com/apache/spark/pull/14991
> function SIZE should return -1 when parameter is null
> -----------------------------------------------------
>
> Key: SPARK-17427
> URL: https://issues.apache.org/jira/browse/SPARK-17427
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Adrian Wang
> Priority: Minor
>
> `select size(null)` returns -1 in Hive. In order to be compatible, we need to
> return -1 also.
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