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https://issues.apache.org/jira/browse/SPARK-20948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16032635#comment-16032635
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Apache Spark commented on SPARK-20948:
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User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/18173
> Built-in SQL Function UnaryMinus/UnaryPositive support string type
> ------------------------------------------------------------------
>
> Key: SPARK-20948
> URL: https://issues.apache.org/jira/browse/SPARK-20948
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Yuming Wang
>
> {{UnaryMinus}}/{{UnaryPositive}} function should support string type, same as
> hive:
> {code:sql}
> $ bin/hive
> Logging initialized using configuration in
> jar:file:/home/wym/apache-hive-1.2.2-bin/lib/hive-common-1.2.2.jar!/hive-log4j.properties
> hive> select positive('-1.11'), negative('-1.11');
> OK
> -1.11 1.11
> Time taken: 1.937 seconds, Fetched: 1 row(s)
> hive>
> {code}
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